ArticlePublisher preview available

The Role of Maintenance and Disengagement in Predicting Reading Comprehension and Vocabulary Learning

American Psychological Association
Journal of Experimental Psychology: Learning, Memory, and Cognition
Authors:
To read the full-text of this research, you can request a copy directly from the authors.

Abstract

This study uses a novel framework based on work by Shipstead, Harrison, and Engle (2016) that includes measures of both working memory capacity and fluid intelligence in an attempt to better understand the processes that influence successful reading comprehension at the latent level. Further, we extend this framework to a second educationally relevant ability: second-language vocabulary learning. A large sample of young adults received a battery of working memory, fluid intelligence, language comprehension, and memory updating tasks. The results indicate that individual differences in reading comprehension and vocabulary learning benefit from the ability to maintain active information, as well as to disengage from no longer relevant information. Subsequently, we provide an interpretation of our results based on the maintenance and disengagement framework proposed by Shipstead et al. (2016). (PsycINFO Database Record (c) 2019 APA, all rights reserved).
The Role of Maintenance and Disengagement in Predicting Reading
Comprehension and Vocabulary Learning
Jessie D. Martin
Georgia Institute of Technology
Zach Shipstead
Colby College
Tyler L. Harrison
University of North Georgia, Dahlonega, Georgia
Thomas S. Redick
Purdue University
Michael Bunting
University of Maryland, College Park, Maryland
Randall W. Engle
Georgia Institute of Technology
This study uses a novel framework based on work by Shipstead, Harrison, and Engle (2016) that includes
measures of both working memory capacity and fluid intelligence in an attempt to better understand the
processes that influence successful reading comprehension at the latent level. Further, we extend this
framework to a second educationally relevant ability: second-language vocabulary learning. A large
sample of young adults received a battery of working memory, fluid intelligence, language comprehen-
sion, and memory updating tasks. The results indicate that individual differences in reading comprehen-
sion and vocabulary learning benefit from the ability to maintain active information, as well as to
disengage from no longer relevant information. Subsequently, we provide an interpretation of our results
based on the maintenance and disengagement framework proposed by Shipstead et al. (2016).
Keywords: maintenance, disengagement, working memory capacity, fluid intelligence, reading
comprehension
Despite decades of research examining processes necessary for
successful reading comprehension, we still do not fully understand
or agree on the cognitive construct which underlie performance.
For example, we have established that working memory capacity
is important for predicting reading comprehension performance
(Daneman & Carpenter, 1980); however, a substantial amount
of-variance remains unaccounted for in studies exploring the re-
lationship between working memory capacity and reading com-
prehension (Borella, Carretti, & Pelegrina, 2010;Chiappe, Siegel,
& Hasher, 2000;Christopher et al., 2012;Engle, Cantor, & Car-
ullo, 1992;Was & Woltz, 2007). In an attempt to further explain
other factors that are essential to performance, many of these
studies have begun to take an increasingly fractionated approach to
filling in the pieces. This deconstructive approach has resulted in
seemingly conflicting conclusions regarding mechanisms of inter-
est, and has not left room for individual differences in mechanisms
used in retrieval as well as organized forgetting. In an effort to
return to a more parsimonious approach, we proposed a more
process-general latent variable framework for the understanding of
individual differences in reading comprehension.
Specifically, we contend that the current foundation for understand-
ing reading comprehension has overemphasized the use of tasks
which primarily reflect maintenance of information, while ignoring
the beneficial role of forgetting— or what we will refer to as disen-
gagement. We argue that individual differences in reading compre-
hension are not strictly related to maintenance processes captured by
complex span measures of working memory capacity, but also to
disengagement processes captured by measures of fluid intelligence.
This approach is based on work by Shipstead et al. (2016) that
defines the primary mechanisms of executive attention in terms of
general processes of maintenance and disengagement (reflected in
complex span and fluid intelligence measures, respectively), rather
than through increasingly specified mechanistic functions like
shifting, updating, and inhibition (Miyake et al., 2000; see Fried-
man & Miyake, 2017 for an updated perspective). We will identify
advantages to our process general approach as well as limitations
to current, more deconstructive, approaches including those that
emphasize the role of processing speed (Christopher et al., 2012)
This article was published Online First June 6, 2019.
Jessie D. Martin, Department of Psychology, Georgia Institute of Tech-
nology; Zach Shipstead, Department of Psychology, Colby College; Tyler
L. Harrison, Department of Psychology, University of North Georgia,
Dahlonega, Georgia; Thomas S. Redick, Department of Psychology, Pur-
due University; Michael Bunting, Center for the Advanced Study of
Language, University of Maryland, College Park, Maryland; Randall W.
Engle, Department of Psychology, Georgia Institute of Technology.
This work was supported by grants from the Office of Naval Research
(N00014-12-1-0406 and N00014-12-1-1011) to Randall W. Engle.
Correspondence concerning this article should be addressed to Jessie D.
Martin, Department of Psychology, Georgia Institute of Technology, North
Avenue NW, Atlanta, GA 30332. E-mail: jessie.martin@gatech.edu
This document is copyrighted by the American Psychological Association or one of its allied publishers.
This article is intended solely for the personal use of the individual user and is not to be disseminated broadly.
Journal of Experimental Psychology:
Learning, Memory, and Cognition
© 2019 American Psychological Association 2020, Vol. 46, No. 1, 140–154
0278-7393/20/$12.00 http://dx.doi.org/10.1037/xlm0000705
140
... For successful reading comprehension, WM is important for several reasons. A reader needs to direct and maintain attention to the text, allocate attentional resources to the mechanics of reading (oculomotor control, decoding, word recognition, etc.), as well as to higher-level processes such as retaining pertinent textual information active in memory to form mental representations of the content (Martin et al., 2020;Shin, 2020). These representations are then subject to constant updating from further incoming input, as the reader gathers new pieces of information from subsequent parts of the text and engages in an ongoing integration process (Burgoyne et al., 2022). ...
... With reference to reading, fluid intelligence may help the disengagement of activated, but contextually inappropriate meanings (e.g., the nontarget meaning(s) of a polysemous word), or with the disengagement of textual representations that are invalidated in later parts of the text. Although underexplored as an aspect of reading comprehension, recent findings showcase that fluid intelligence strongly correlates with reading comprehension, while WM may not have a direct influence beyond its association with fluid intelligence (Martin et al., 2020). That is, the correlation between WM and reading comprehension was found to be accounted for by variance that WM shared with fluid intelligence. ...
... For example, one would need to quickly disengage resources from the judgment task, in order to focus and perform well on the recall (memory) component. Nevertheless, as WM and fluid intelligence are still considered distinct mechanisms, if fluid intelligence exerts independent influence on the processing of irony, as it appears to be the case in reading comprehension (Martin et al., 2020), its effects should be visible irrespective of WM influences. ...
Article
Full-text available
The comprehension of irony involves a sophisticated inferential process requiring language users to go beyond the literal meaning of an utterance. Because of its complex nature, we hypothesized that working memory (WM) and fluid intelligence, the two main components of executive attention, would be involved in the understanding of irony: the former by maintaining focus and relevant information active during processing, the latter by disengaging irrelevant information and offering better problem-solving skills. In this eye-tracking reading experiment, we investigated how adults (N = 57) process verbal irony, based on their executive attention skills. The results indicated a null (or indirect) effect for WM, while fluid intelligence directly modulated the comprehension and processing of irony during reading. As fluid intelligence is an important individual-difference variable, the findings pave the way for future research on developmental and clinical populations who tend to struggle with nonliteral language.
... Considering the most important executive processes, previous research emphasizes executive/attentional control, working memory, maintenance, and disengagement, which are all thought to collaborate in completing a task goal (Shipstead et al. 2016;Mashburn et al. 2021;Engle 2018Engle , 2002Martin et al. 2020). During task completion, working memory is heavily involved in maintenance processes whereas disengagement is thought to heavily involve fluid aspects of intelligence (Shipstead et al. 2016). ...
... Therefore, the hierarchical structure as often suggested in the commonly used CHC model is not necessary when just as much of the variance can be explained without it . Thus, as a non-g model that is well supported by basic scientific evidence (Burgoyne et al. 2021(Burgoyne et al. , 2022Shipstead et al. 2016;Mashburn et al. 2021; see also Martin et al. 2020;Peng and Swanson 2022), process overlap theory is a more parsimonious approach to thinking about assessment. Further, considering the utility of examining subprocesses of g, as outlined above, non-g POT is also better for working toward equity and fairness goals. ...
... Although some findings are mixed about the extent to which training working memory and domain-general executive processes is beneficial for far transfer (see Redick et al. 2013;Shipstead et al. 2012), the recent evidence outlined above for tailored intervention for more diverse needs is promising. There is also empirical evidence suggesting the importance of examining domain-general vs. more domain-specific differences for how to better tailor forms of intervention (Martin et al. 2020;Peng and Swanson 2022). More sophisticated modeling with network and advanced statistical methods also suggests that applying non-g POT-based models would be useful when thinking about which cognitive processes are most important for how to redesign intelligence models in subsequent research ). ...
Article
Full-text available
Historically, assessments of human intelligence have been virtually synonymous with practices that contributed to forms of inequality and injustice. As such, modern considerations for assessing human intelligence must focus on equity and fairness. First, we highlight the array of diversity, equity, and inclusion concerns in assessment practices and discuss strategies for addressing them. Next, we define a modern, non-g, emergent view of intelligence using the process overlap theory and argue for its use in improving equitable practices. We then review the empirical evidence, focusing on sub-measures of g to highlight the utility of non-g, emergent models in promoting equity and fairness. We conclude with suggestions for researchers and practitioners.
... Considering the most important executive processes, previous research emphasizes executive/attentional control, working memory, maintenance, and disengagement, which are all thought to collaborate in completing a task goal (Shipstead et al., 2016;Mashburn et al., 2021;Engle, 2018;Martin et al., 2020; also see Engle, 2002). During task completion, working memory is heavily involved in maintenance processes whereas disengagement is thought to heavily involve fluid aspects of intelligence (Shipstead et al., 2016). ...
... Therefore, the hierarchical structure as often suggested in the commonly used CHC model is not necessary when just as much of the variance can be explained without it . Thus, as a non-g model that is well supported by basic scientific evidence (Burgoyne et al., 2021(Burgoyne et al., , 2022Shipstead et al., 2016;Mashburn et al., 2021; also see Martin et al., 2020;Peng & Swanson, 2022), Process Overlap Theory is a more parsimonious approach to thinking about assessment. Further, considering the utility of examining subprocesses of g, as outlined above, non-g POT is also better for working toward equity and fairness goals. ...
... Although some findings are mixed about the extent to which training working memory and domain general executive processes is beneficial for far transfer (see Redick et al., 2013;Shipstead et al., 2012), the recent evidence outlined above for tailored intervention for more diverse needs is promising. There is also empirical evidence suggesting the importance of examining domain general vs. more domain specific differences for how to better tailor forms of intervention (Martin et al., 2020;Peng & Swanson, 2022). More sophisticated modeling with network and advanced statistical methods also suggests that applying non-g POT-based models would be useful for thinking about which cognitive processes are most important for how to redesign intelligence models in subsequent research . ...
Preprint
Full-text available
Historically, assessments of human intelligence have been virtually synonymous with practices that contributed to forms of inequality and injustice. As such, modern considerations for assessing human intelligence must focus on equity and fairness. First, we highlight the array of diversity, equity, and inclusion concerns in assessment practices and discuss strategies for addressing them. Next, we define a modern, non-g, emergent view of intelligence using Process Overlap Theory and argue for its use in improving equitable practices. We then review empirical evidence focusing on sub-measures of g to highlight the utility of non-g, emergent models in promoting equity and fairness. We conclude with suggestions for researchers and practitioners.
... It is also possible that neither decay nor interference can explain the current results. It might be that linguistic prediction is disengaged when it is less beneficial or more costly to maintain (see also Martin et al., 2020). For example, Wlotko and Federmeier (2015) found a lack of prediction-related effects on the N400 when the rate of incoming words during sentence reading was very high, suggesting that individuals did not engage the same mechanisms as when the rate was slower. ...
Article
Full-text available
The current study investigates for how long readers maintain expectations about an upcoming discourse relation. We use the pair of discourse markers On the one hand (OT1H) and On the other hand (OTOH) to test the facilitative effect of OT1H on the processing of OTOH and the sensitivity of this effect to the presence of intervening material. Results from a story continuation study indicate that intervening material slightly weakens the effect of OT1H on offline representations of the discourse. Results from a self-paced reading and two eye-tracking studies suggest that the presence of intervening material diminishes the facilitative effect of OT1H in online processing. These results support memory-based models of processing by showing that discourse dependencies, while they are built as fine-grained representations, are not unbounded in real-time processing.
... Many cognitive constructs (e.g., WM, ART, reasoning) are intercorrelated, complicating the attribution of outcomes to specific predictors (Dubois et al., 2018;James et al., 2018). High correlations across tasks can lead to inconsistent findings (e.g., Martin et al., 2020;Freed et al., 2017). A major challenge in this context is multicollinearity, where highly correlated predictors (e.g., WM and ART) complicate regression analysis (Cohen et al., 2003). ...
Article
Full-text available
Every utterance in discourse we produce arises from the interaction of numerous cognitive functions, such as semantic memory, where we store the meanings of words, executive function and working memory as required for maintenance of a discourse goal, and social cognitive abilities, such as mind-reading capacity as required for tuning what we say to what others know or believe. In this way, a single utterance potentially integrates very different cognitive capacities into a basic discourse processing unit. This suggests that discourse processing and management is a very rich phenomenon that requires a multidimensional approach. We propose that a model of discourse management is comprised of three primary components that interact synergistically: (i) dynamicity, (ii) predictability, and (iii) meta-representationality. Cognitive functions play a pivotal role in the underlying processes, contributing to the development and unfolding of discourse. Understanding the correspondence between individual differences in discourse management (i.e., discourse perception and production) and cognitive functions can shed light on the intricate relationship between language and cognition in discourse management, as well as the appropriate psychometric measures to address this complex interaction. This narrative review presents aspects of discourse management, psychometric measures to comprehensively address these aspects. We close with a discussion of challenges and open questions.
... Several authors have emphasized the importance of working memory in reading, especially when keeping information active and to determine the coherence of a text [94][95][96][97]. Likewise, they consider that working memory can be considered a predictor of reading ability. ...
Article
Full-text available
The problem of reading comprehension at the university level has not been sufficiently explored in the field of education research. Understanding written texts is an essential prerequisite for academic success during university. Consequently, reading comprehension challenges can influence the dropout rate at the university level. On the other hand, research has been conducted from a cognitive perspective, without considering affective variables such as reading motivation and its relationship with linguistic and psychological variables. In this study, five questionnaires were administered to a sample of 65 teaching students from different disciplines. The questionnaires dealt with linguistic dimensions such as reading comprehension, at lexical, textual, and discursive levels; psychological aspects such as reading motivation; and cognitive aspects such as working memory. The results obtained through bivariate and mediation analyses show the mediating role of vocabulary in reading comprehension and other cognitive and affective variables. In this context, working memory has a positive indirect effect on more explicit processing tasks in reading comprehension of long texts associated with discourse comprehension. Finally, intrinsic motivation has a positive indirect effect on reading fluency and also on the comprehension of short texts. It also correlates positively with vocabulary tasks. These results are relevant in order to establish a reading profile of university students who have reading comprehension problems, as found in this study.
... That said, researchers and test construction professionals more recently have also recognized the need to further refine and improve the measurement properties of complex span measures. One approach has been to give a battery of complex span measures to participants, conduct confirmatory factor analysis to derive a latent working memory variable from the manifest scores, and then use the latent variable in predictive analyses (e.g., Martin et al., 2020). Confirmatory factor analysis not only allows one to have greater confidence in measurement by appealing to the variance common across a set of imperfect measures but also corrects for measurement error. ...
Article
The authors discuss the continued viability of the working memory construct by examining its origin and historical development in the field of psychology and critiquing it on theoretical, philosophical, and methodological grounds. They do so by asking and answering the following questions: (a) When and why did the construct first emerge in psychological theorizing?, (b) What are the historical trends in how has it been defined operationally?, (c) How have researchers related it to the construct of intelligence at different points in time?, (d) Is it a natural kind or a cultural invention?, (e) Is progress being made in understanding the construct?, and (f) Where do we go from here? They conclude that there are sufficient reasons for continuing to examine the construct given its considerable predictive value and suggest that the most promising approach would be to delve further into its association with fluid intelligence by using several kinds of methods.
... Whereas maintenance refers to keeping track of goal-relevant information, disengagement refers to removing irrelevant (or no-longer-relevant) information from active processing and tagging it for nonretrieval. Both functions require attention control, although they can also be modeled as separate but correlated latent factors (see Martin, Shipstead, et al., 2020). ...
Article
Full-text available
Individual differences in the ability to control attention are correlated with a wide range of important outcomes, from academic achievement and job performance to health behaviors and emotion regulation. Nevertheless, the theoretical nature of attention control as a cognitive construct has been the subject of heated debate, spurred on by psychometric issues that have stymied efforts to reliably measure differences in the ability to control attention. For theory to advance, our measures must improve. We introduce three efficient, reliable, and valid tests of attention control that each take less than 3 min to administer: Stroop Squared, Flanker Squared, and Simon Squared. Two studies (online and in-lab) comprising more than 600 participants demonstrate that the three “Squared” tasks have great internal consistency (avg. = .95) and test–retest reliability across sessions (avg. r = .67). Latent variable analyses revealed that the Squared tasks loaded highly on a common factor (avg. loading = .70), which was strongly correlated with an attention control factor based on established measures (avg. r = .81). Moreover, attention control correlated strongly with fluid intelligence, working memory capacity, and processing speed and helped explain their covariation. We found that the Squared attention control tasks accounted for 75% of the variance in multitasking ability at the latent level, and that fluid intelligence, attention control, and processing speed fully accounted for individual differences in multitasking ability. Our results suggest that Stroop Squared, Flanker Squared, and Simon Squared are reliable and valid measures of attention control. The tasks are freely available online: https://osf.io/7q598/.
Article
Full-text available
Working memory capacity (WMC) has received a great deal of attention in cognitive psychology partly because WMC correlates broadly with other abilities (e.g., reading comprehension, second-language proficiency, fluid intelligence) and thus seems to be a critical aspect of cognitive ability. However, it is still rigorously debated why such correlations occur. Some theories posit a single ability (e.g., attention control, short-term memory capacity, controlled memory search) as the primary reason behind WMC’s predictiveness, whereas others argue that WMC is predictive because it taps into multiple abilities. Here, we tested these single- and multifaceted accounts of WMC with a large-scale (N = 974) individual-differences investigation of WMC and three hypothesized mediators: attention control, primary memory, and secondary memory. We found evidence for a multifaceted account, such that no single ability could fully mediate the relation between WMC and higher order cognition (i.e., reading comprehension and fluid intelligence). Further, such an effect held regardless of whether WMC was measured via complex span or n-back.
Article
Full-text available
Individual differences in processing speed and executive attention have both been proposed as explanations for individual differences in cognitive ability, particularly general and fluid intelligence (Engle et al., 1999; Kail & Salthouse, 1994). Both constructs have long intellectual histories in scientific psychology. This article attempts to describe the historical development of these constructs, particularly as they pertain to intelligence. It also aims to determine the degree to which speed and executive attention are theoretical competitors in explaining individual differences in intelligence. We suggest that attention is the more fundamental mechanism in explaining variation in human intelligence.
Article
Full-text available
The verbal fluency task requires generation of category exemplars and appears to be an example of what M. Moscovitch (1995) calls a strategic test of memory retrieval. Four experiments explored the role of individual differences in working memory (WM) capacity on verbal fluency under various secondary load conditions. High WM participants consistently recalled more exemplars. However, load conditions caused a decline in recall only for high WM participants. Low WM participants showed no effect of secondary workload on exemplar generation. WM group differences and load effects were observed even in the 1st min of retrieval, which suggests that differences were not due to differences in knowledge. A model of retrieval is supported that relies on cue-based-automatic activation, monitoring of output for errors, controlled suppression of previously recalled items, and controlled strategic search.
Article
Full-text available
Reaction time is believed to be a good indicator of the speed and efficiency of mental processes and is a ubiquitous variable in the behavioral sciences. Despite this popularity, there are numerous issues associated with using reaction time (RT), specifically in differential and developmental research. Here, we identify and focus on two main problems-unreliability and sensitivity to speed-accuracy interactions. The use of difference scores is a primary factor that leads to many RT measures having demonstrably low reliability, and RT measures in general often do not properly account for speed-accuracy interactions. Both factors jeopardize the validity and interpretability of results based on RT. Here, we evaluate conceptually and empirically how these issues affect individual differences research. Although the empirical evidence we provide are primarily within the domains of attention control and task switching, we highlight examples from various other areas of psychological inquiry. We also discuss many of the statistical and methodological alternatives available to researchers conducting correlational studies. Ultimately, we encourage researchers comparing individuals of differing cognitive and developmental levels to strongly consider using these alternatives in lieu of RT, specifically RT difference scores.
Article
Full-text available
In 2 experiments the authors examined whether individual differences in working-memory (WM) capacity are related to attentional control. Experiment 1 tested high- and low-WM-span (high-span and low-span) participants in a prosaccade task, in which a visual cue appeared in the same location as a subsequent to-be-identified target letter, and in an antisaccade task, in which a target appeared opposite the cued location. Span groups identified targets equally well in the prosaccade task, reflecting equivalence in automatic orienting. However, low-span participants were slower and less accurate than high-span participants in the antisaccade task, reflecting differences in attentional control. Experiment 2 measured eye movements across a long antisaccade session. Low-span participants made slower and more erroneous saccades than did high-span participants. In both experiments, low-span participants performed poorly when task switching from antisaccade to prosaccade blocks. The findings support a controlled-attention view of WM capacity.
Article
Full-text available
Inhibition is often conceptualized as a unitary construct reflecting the ability to ignore and suppress irrelevant information. At the same time, it has been subdivided into inhibition of prepotent responses (i.e., the ability to stop dominant responses) and resistance to distracter interference (i.e., the ability to ignore distracting information). The present study investigated the unity and diversity of inhibition as a psychometric construct, and tested the hypothesis of an inhibition deficit in older age. We measured inhibition in young and old adults with 11 established laboratory tasks: antisaccade, stop-signal, color Stroop, number Stroop, arrow flanker, letter flanker, Simon, global-local, positive and negative compatibility tasks, and n-2 repetition costs in task switching. In both age groups, the inhibition measures from individual tasks had good reliabilities, but correlated only weakly among each other. Structural equation modeling identified a 2-factor model with factors for inhibition of prepotent responses and resistance to distracter interference. Older adults scored worse in the inhibition of prepotent response, but better in the resistance to distracter interference. However, the model had low explanatory power. Together, these findings call into question inhibition as a psychometric construct and the hypothesis of an inhibition deficit in older age. (PsycINFO Database Record
Article
Full-text available
Working memory capacity and fluid intelligence have been demonstrated to be strongly correlated traits. Typically, high working memory capacity is believed to facilitate reasoning through accurate maintenance of relevant information. In this article, we present a proposal reframing this issue, such that tests of working memory capacity and fluid intelligence are seen as measuring complementary processes that facilitate complex cognition. Respectively, these are the ability to maintain access to critical information and the ability to disengage from or block outdated information. In the realm of problem solving, high working memory capacity allows a person to represent and maintain a problem accurately and stably, so that hypothesis testing can be conducted. However, as hypotheses are disproven or become untenable, disengaging from outdated problem solving attempts becomes important so that new hypotheses can be generated and tested. From this perspective, the strong correlation between working memory capacity and fluid intelligence is due not to one ability having a causal influence on the other but to separate attention-demanding mental functions that can be contrary to one another but are organized around top-down processing goals.
Article
Full-text available
Executive functions (EFs) are high-level cognitive processes, often associated with the frontal lobes, that control lower level processes in the service of goal-directed behavior. They include abilities such as response inhibition, interference control, working memory updating, and set shifting. EFs show a general pattern of shared but distinct functions, a pattern described as "unity and diversity." We review studies of EF unity and diversity at the behavioral and genetic levels, focusing on studies of normal individual differences and what they reveal about the functional organization of these cognitive abilities. In particular, we review evidence that across multiple ages and populations, commonly studied EFs (a) are robustly correlated but separable when measured with latent variables; (b) are not the same as general intelligence or g; (c) are highly heritable at the latent level and seemingly also highly polygenic; and (d) activate both common and specific neural areas and can be linked to individual differences in neural activation, volume, and connectivity. We highlight how considering individual differences at the behavioral and neural levels can add considerable insight to the investigation of the functional organization of the brain, and conclude with some key points about individual differences to consider when interpreting neuropsychological patterns of dissociation.
Chapter
This publication is the opening number of a series which the Psychometric Society proposes to issue. It reports the first large experimental inquiry, carried out by the methods of factor analysis described by Thurstone in The Vectors of the Mind 1. The work was made possible by financial grants from the Social Science Research Committee of the University of Chicago, the American Council of Education, and the Carnegie Corporation of New York. The results are eminently worthy of the assistance so generously accorded. Thurstone’s previous theoretical account, lucid and comprehensive as it is, is intelligible only to those who have a knowledge of matrix algebra. Hence his methods have become known to British educationists chiefly from the monograph published by W. P. Alexander8. This enquiry has provoked a good deal of criticism, particularly from Professor Spearman’s school ; and differs, as a matter of fact, from Thurstone’s later expositions. Hence it is of the greatest value to have a full and simple illustration of his methods, based on a concrete inquiry, from Professor Thurstone himself.
Article
The article reports four experiments with complex-span tasks in which encoding of memory items alternates with processing of distractors. The experiments test two assumptions of a computational model of complex span, SOB-CS: (1) distractor processing impairs memory because distractors are encoded into working memory, thereby interfering with memoranda; and (2) free time following distractors is used to remove them from working memory by unbinding their representations from list context. Experiment 1 shows that distractors are erroneously chosen for recall more often than not-presented stimuli, demonstrating that distractors are encoded into memory. Distractor intrusions declined with longer free time, as predicted by distractor removal. Experiment 2 shows these effects even when distractors precede the memory list, ruling out an account based on selective rehearsal of memoranda during free time. Experiments 3 and 4 test the notion that distractors decay over time. Both experiments show that, contrary to the notion of distractor decay, the chance of a distractor intruding at test does not decline with increasing time since encoding of that distractor. Experiment 4 provides additional evidence against the prediction from distractor decay that distractor intrusions decline over an unfilled retention interval. Taken together, the results support SOB-CS and rule out alternative explanations. Data and simulation code are available on Open Science Framework: osf.io/3ewh7.