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Thinking about attention: Successive approximations to a productive taxonomy
Abstract
Attention, the recruitment of processing resources, is viewed as pivotal for understanding normal behaviour and thought as well as the disorganizations associated with brain damage and disease. A brief history foreshadows aspects of a proposed taxonomy of attention that builds upon Posner's tripartite taxonomy. Posner's influential taxonomy views attention as a set of isolable neural systems (alerting, orienting and executive control), often working together to organize behaviour. For measuring the efficacy of these three networks, Posner and colleagues created the Attention Network Test (ANT). The impact of the taxonomy and this model task for exploring it is illustrated by the facts that they have spawned numerous variants designed for different purposes and that one or another variant has been used in almost a thousand publications. We have previously built upon this conceptual framework by considering: two modes of control over resource allocation which we labelled exogenous and endogenous and three domains over which these modes of control are presumed to operate (space, time and task or activity). The Combined Attention Systems Test (or CAST) was developed to measure the efficacy of the six kinds of attention implied by revised taxonomy. Lastly, this taxonomic effort is further developed by incorporating the distinction between overt, observable behaviour in the “real” world and covert “behaviour” in the realm of thought and imagination.
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In 2002, Fan and his colleagues developed the Attention Network Test (ANT), a cognitive tool that provides a score for each of the attentional networks (alerting, orienting, and executive functioning). Since publication, this study has been cited over 3,500 times. The authors state one of the indicated uses of this tool is to measure how different interventions, both behavioural and pharmacological, influence the networks of attention. The present review focuses on this premise and investigating how various aspects of lifestyle differently impact the networks of attention. Whether trying to optimize the attentional networks to improve cognitive performance, or to prevent the cognitive decline that occurs with age, this review summarizes what practices promote efficiency within the alerting, orienting, and executive functioning networks. The specific areas of lifestyle this review focuses on are meditation, exercise, drug use, sleep, and environmental or social factors.
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Are there differences between bilinguals and monolinguals in non-linguistic cognitive processes related to attention? Recent interest in this question, which has a long history, was stimulated by ideas presented in Bialystok’s 2001 book: Bilingualism in development: Language, literacy, and cognition. Because attention is a multi-faceted construct Costa et al. (Cognition 106(1):59–86, 2008, Cognition 113(2):135–149, 2009) sought to answer this question using the attention network test (ANT), a simple-to-administer tool that was designed to measure the efficacy of three attention networks: alerting, orienting and executive control. Using the ANT Database, a recently developed repository of data extracted from studies that have used the ANT to answer any question, we identified 16 papers that followed Costa’s pioneering use of the ANT to address the question whether bilingualism is associated with differences in attention. In this paper we begin by reviewing the methods and findings from Costa’s studies, and then report the results of three meta-analyses (conducted separately for children, young adults and middle-aged adults) of the data reported in these 16 papers. Whereas, there were no noteworthy effects of language status on alerting or orienting in any group, our meta-analysis of the studies that tested young adults revealed, in agreement with Costa et al. (2008) a bilingual advantage in executive control. A similar bilingual advantage was not observed in the other age groups.
The Organization of Behavior has played a significant part in the development of behavioural neuroscience for the last 70 years. This book introduced the concepts of the "Hebb synapse", the "Hebbian cell assembly" and the "Phase sequence". The most frequently cited of these is the Hebb synapse, but the cell assembly may be Hebb's most important contribution. Even after 70 years, Hebb's theory is still relevant because it is a general framework for relating behavior to synaptic organization through the development of neural networks. The Organization of Behavior was Hebb's 40th publication. His first published papers in 1937 were on the innate organization of the visual system and he first used the phrase "the organization of behavior" in 1938. However, Hebb wrote a number of unpublished papers between 1932 and 1945 in which he developed the ideas published in The Organization of Behavior. Thus, the concept of the neural organization of behavior was central to Hebb's thinking from the beginning of his academic career. But his thinking about the organization of behavior in 1949 was different from what it was between 1932 and 1937. This paper examines Hebb's early ideas on the neural basis of behavior and attempts to trace the rather arduous series of steps through which he developed these ideas into the book that was published as The Organization of Behavior. Using the 1946 typescript and Hebb's correspondence we can see a number of changes made in the book before it was published. Finally, a number of issues arising from the book, and the importance of the book today are discussed.
Attention is a central component of cognitive and behavioural processes and plays a key role in basic and higher-level functioning. Posner’s model of attention describes three components or networks of attention: the alerting, which involves high intensity states of arousal; the orienting, which involves the selective direction of attention; and the executive control, which involves cognitive functions such as conflict resolution and working memory. The Attention Network Test (ANT) is a computerized testing measure that was developed to measure these three networks of attention. This project describes the ANT, its widely used variants, and the recently developed ANT Database, a repository of data extracted from all studies that have used the ANT as of 2019. To illustrate the potential uses of the database, two meta-analyses conducted using the ANT Database are described. One explores task performance in children with and without attention deficit/hyperactivity disorder (ADHD). The other one explores regional differences between studies conducted in China, Europe, and the United States. We are currently in the process of integrating the database into a publicly available web interface. When that work is complete, researchers, clinicians, and the general public will be able to use the database to explore topics of interest related to attention.
Children today spend less time in nature than previous generations and there is concern that this shift negatively impacts children’s cognitive abilities, particularly their ability to direct their attention. Theories, such as the Attention Restoration Theory (ART), suggest that contact with nature may replenish endogenous attention (e.g., directed, voluntary attention). There is a lack of rigorous research on how contact with nature is associated with attentional performance in children. This study employed a quasi-experimental design and included a sample of typically developing children to investigate performance on computerized endogenous and exogenous attention tasks before and after exposure to one of two interventions – a 30-min walk in either an urban (n = 30) or natural (forested, n = 30) environment. The two experimental groups were equivalent with regard to sex ratio, age, IQ, and connectedness to nature. Attention was assessed using the Combined Attention Systems Test (CAST), a state-of-the-art assessment tool designed to evaluate exogenous and endogenous attention characteristics. Bayesian hierarchical modeling of both response time (RT) and error rate (ER) was employed to evaluate the fixed effect of attentional measures and interactions with session and group. Consistent with predictions of ART, results support credible effects of the nature intervention on two measures of endogenous attention: Alerting RT: d = 0.85 (95% CI: 0.21–1.8), Orienting ER: d = 1.45 (95% CI: 0.17–7.18), but not on any of the measures of exogenous attention. Clinical Trial Registration: https://www.isrctn.com/, identifier ISRCTN17762011.
In this article, we challenge the usefulness of “attention” as a unitary construct and/or neural system. We point out that the concept has too many meanings to justify a single term, and that “attention” is used to refer to both the explanandum (the set of phenomena in need of explanation) and the explanans (the set of processes doing the explaining). To illustrate these points, we focus our discussion on visual selective attention. It is argued that selectivity in processing has emerged through evolution as a design feature of a complex multi-channel sensorimotor system, which generates selective phenomena of “attention” as one of many by-products. Instead of the traditional analytic approach to attention, we suggest a synthetic approach that starts with well-understood mechanisms that do not need to be dedicated to attention, and yet account for the selectivity phenomena under investigation. We conclude that what would serve scientific progress best would be to drop the term “attention” as a label for a specific functional or neural system and instead focus on behaviorally relevant selection processes and the many systems that implement them.
The concept of attention is pivotal for our understanding of normal and abnormal human performance. The Attention Network Test (ANT) is a frequently used task for measuring three networks of attention (alerting, orienting, and executive control). Inspired by the ANT, the AttentionTrip is a videogame-like task also designed to measure these networks. The primary objective of this study, to compare the ANT and the AttentionTrip on their ability to engage the test-taker, was achieved by having the same participants’ complete measures of user engagement after administration of each test. Whereas both tasks generated robust attention network scores, participants were significantly more engaged by the AttentionTrip. The AttentionTrip thus provides an alternative to the ANT that can sustain participant engagement, making it worth considering for research that involves repeated testing or when studying participants prone to boredom.
Theories of attention, too often generated from artificial laboratory experiments, may have limited validity when attention in the natural world is considered. For instance, for more than two decades, conceptualizations of “reflexive” and “volitional” shifts of spatial attention have been grounded in methodologies that do not recognize or utilize the basic fact that people routinely use the eyes of other people as rich and complex attentional cues. This fact was confirmed by our novel discovery that eyes will trigger a reflexive shift of attention even when they are presented centrally and are known to be spatially nonpredictive. This exploration of real-world attention also led to our finding that, contrary to popular wisdom, arrows, like eyes, are capable of producing reflexive shifts of attention—a discovery that brings into question much of the existing attention research. We argue that research needs to be grounded in the real world and not in experimental paradigms. It is time for cognitive psychology to reaffirm the difficult task of studying attention in a manner that has relevance to real-life situations.
A goal of neuropsychology is to connect cognitive functions with underlying neural systems. Posner (1984; in press) has proposed a framework for doing so in which elementary mental operations in cognitive models are expressed in terms of component facilitations and inhibitions in the performance of normal persons. Studies of brain-injured patients are used to link these components to underlying neural systems. In the area of spatial attention one such component is the tendency to inhibit orienting towards visual locations which have been previously attended (inhibition of return). Here we report studies in patients and normals which demonstrate the relationship of this component to neural systems which generate saccades.
The first experiment showed that midbrain lesions impairing saccade generation produced a concurrent loss of the inhibition of return, whereas cortical components shown to impair facilitatory components did not. The second and third experiments show that the inhibition of return is associated with a bias in eye movements against returning to a previously inhibited location and indicate that inhibition of return occurs even when the eyes are moved to an unchanging visual target.
The deficits found in patients and the conditions under which the inhibition is found in normals suggest that inhibition of return may function to favour foveation of information at new locations
Reports 5 experiments conducted with 52 paid Ss in which detection of a visual signal required information to reach a system capable of eliciting arbitrary responses required by the experimenter. Detection latencies were reduced when Ss received a cue indicating where the signal would occur. This shift in efficiency appears to be due to an alignment of the central attentional system with the pathways to be activated by the visual input. It is also possible to describe these results as being due to a reduced criterion at the expected target position. However, this ignores important constraints about the way in which expectancy improves performance. A framework involving a limited-capacity attentional mechanism seems to capture these constraints better than the more general language of criterion setting. Using this framework, it was found that attention shifts were not closely related to the saccadic eye movement system. For luminance detection, the retina appears to be equipotential with respect to attention shifts, since costs to unexpected stimuli are similar whether foveal or peripheral. (26 ref) (PsycINFO Database Record (c) 2012 APA, all rights reserved)
Divides the study of human attention into 3 components: alertness, selectivity, and processing capacity. Experimental techniques designed to separate these components and examine their interrelations within comparable tasks are outlined. It is shown that a stimulus may be used to increase alertness for processing all external information, to improve selection of particular stimuli, or to do both simultaneously. Development of alertness and selectivity are separable, but may go on together without interference. Moreover, encoding a stimulus may proceed without producing interference with other signals. Thus, the contact between an external stimulus and its representation in memory does not appear to require processing capacity. Limited capacity results are obtained when mental operations, E.g., response selection or rehearsal, must be performed on the encoded information. (45 ref.) (PsycINFO Database Record (c) 2012 APA, all rights reserved)
The differential allocation of information processing resources over time, here termed "temporal attention," may be achieved by relatively automatic "exogenous" or controlled "endogenous" mechanisms. Over 100 years of research has confounded these theoretically distinct dimensions of temporal attention. The current report seeks to ameliorate this oversight by novel application of 2 experimental methodologies. A scheme imported from the animal learning literature (Rescorla's "truly random control" procedure) was used to eliminate any temporal contingency between signals and targets. An auditory stimulus imported from the psychophysical literature (correlated vs. uncorrelated noise) was used to provide a salient signal that entailed no local or global change in intensity. Purely endogenous temporal attention (generated by a reliable signal-target contingency in the absence of a change in intensity) is characterized by robust improvements in speed and accuracy of responding. Purely exogenous temporal attention (generated by an intensity increase in the absence of contingency) is characterized by a brief period of faster responding. When exogenous temporal attention is elicited in the context of endogenous temporal attention, the decrease in response time that follows an intense signal is accompanied by a decrease in response accuracy. (PsycINFO Database Record (c) 2012 APA, all rights reserved).
A model for conceptualizing the components or elements of attention is presented. The model substitutes for the diffuse and global concept of attention a group of four processes and links them to a putative system of cerebral structures. Data in support of the model are presented; they are derived from neuropsychological test scores obtained from two samples, the first consisting of 203 adult neuropsychiatric patients and normal control subjects, and the second, an epidemiologically-based sample of 435 elementary school children. Principal components analyses of test scores from these two populations yielded similar results: a set of independent elements of attention that are assayed by different tests. This work presents a heuristic for clinical research in which the measurement of attention is essential.
Background
Depression is an all-too-common mood disorder that has been linked in various ways to the cognitive concept of attention. The Attention Network Test, based on the influential taxonomy of attention originally proposed by Posner, can be used to measure the efficacy of three components or networks of attention: Alerting, Orienting and Executive Control. Our focus here is to discover how depression might affect these networks.
Methods
Studies related to attention and depression were selected for this meta-analytic review using the online Attention Network Test (ANT) Database (Arora, Lawrence & Klein, 2020) resource. Based on the inclusion and exclusion criteria, 5 publications were analyzed with a Bayesian hierarchical model to compare participants with and without a diagnosis of depression.
Results
The posterior distribution of our model revealed no credible differences in the Alerting and Orienting networks but showed credible non-zero values for Executive Control. This suggests that Executive Control is less efficient in individuals suffering from depression.
Limitations
As literature using the ANT with depressed participants is limited, the methodological variability between studies in this meta-analysis should be considered when interpreting these results.
Conclusion
This meta-analysis review is the first quantitative review that aimed to address the ANT-depression literature. A consistent finding of no alerting and no orienting deficit but a deficit in the executive control suggests that some, but not all, components of attention are impaired in depression.
Attention is a pivotal cognitive function and efforts to understand its properties and operations are fundamental. Building upon the best known taxonomy of attention put forward by Posner and Petersen (1990), the Attention Network Test (ANT; Fan et al., 2001) was designed to efficiently provide scores that reflect the efficacy of alerting, orienting and executive control. The ANT has not only been very widely adopted by scholars around the world, it has inspired a wide range of variants, the ANTs, - each with its own purpose. This review will describe the origin of the ANT in the taxonomic contributions of Posner and the evolution of the ANTs with some discussion of the nature and rationale for each major variant described here. We briefly allude to minor modifications of the ANT and present some suggestions related to data reporting and data analysis. We end with some projections about the future use of the original ANT and its notable variants.
Attentional abilities affect the social, cognitive, and intellectual growth of human development. Tools for the assessment of attention can facilitate the early diagnosis of attention disorders and thereby earlier interventions and improvements. The Attention Network Test (ANT) is a well-established, computerized task that measures the three networks of attention: alerting, orienting, and executive functioning. Unfortunately, the ANT is not very engaging. Maintaining engagement is important in assessments of attention, particularly when repeated assessments are required, and may be challenging with child populations. This project compares youth engagement on a child-friendly version of the ANT (ANT-C) with a recently developed video-game-like task called AttentionTrip©. Whereas both tasks generated robust network scores, there was a strong advantage for AttentionTrip© on measures of engagement. This extends previous findings that the AttentionTrip© task is an appropriate alternative for participants who are prone to boredom or mind-wandering.
The possible relations between eye movements and shifts of attention are considered in the context of the contemporary proposal of embodied cognition. The focus of this historical review is Klein's oculomotor readiness hypothesis for how visuospatial attention might be allocated when under endogenous control. When eye movements are actually executed, attention shifts in advance of these movements. But when eye movements are prepared but not executed, shifts of attention are not observed. Conversely, when attention is allocated endogenously and covertly to a location in space, eye movements to that location are not prepared. These findings suggest that covert spatial orienting when under endogenous control is more dis-embodied than embodied cognition.
Temporal attention is the focusing of perceptual resources at a particular point in time. Valid temporal cue information has the capability to improve performance by reducing reaction times, while invalid information has the possibility of impairing performance. The performance difference between valid and invalid conditions is called a temporal cueing effect (TCE). We explored how different alerting mechanisms interact with a participant's ability to utilize temporal information cues, using the Kingstone (The Quarterly Journal of Experimental Psychology, 44(1), 69-104, 1992) temporal cueing paradigm. Extracting the alerting procedure from Lawrence and Klein (Journal of Experimental Psychology: General, 142(2), 560-572, 2013), one of two different temporally contingent warning signals were presented to participants during a trial. The "hi-intensity" warning signal increases intensity and elicits both exogenous and endogenous alerting mechanisms. The "no-intensity" warning signal is isointense relative to baseline and elicits only endogenous alerting mechanisms. Two experiments conducted previously using a discrimination task showed interference between the signal intensity and task difficulty, where the "no-intensity" signal failed to elicit TCEs. In the present study, we implemented a detection task, reducing the mental effort required for a response. The results showed equal TCEs in both signal conditions. We argue for independence of these alerting mechanisms, by way of Sternberg's (Acta Psychologica, 30, 276-315, 1969) additive factor method. Arguments contrasting what mechanism is being impacted by this paradigm are further outlined.
Theories of visual attention deal with the limit on our ability to see (and later report) several things at once. These theories fall into three broad classes. Object-based theories propose a limit on the number of separate objects that can be perceived simultaneously. Discrimination-based theories propose a limit on the number of separate discriminations that can be made. Space-based theories propose a limit on the spatial area from which information can be taken up. To distinguish these views, the present experiments used small (less than 1 degree), brief, foveal displays, each consisting of two overlapping objects (a box with a line struck through it). It was found that two judgments that concern the same object can be made simultaneously without loss of accuracy, whereas two judgments that concern different objects cannot. Neither the similarity nor the difficulty of required discriminations, nor the spatial distribution of information, could account for the results. The experiments support a view in which parallel, preattentive processes serve to segment the field into separate objects, followed by a process of focal attention that deals with only one object at a time. This view is also able to account for results taken to support both discrimination-based and space-based theories.
In the present study we investigated whether the visually allocated "beam" studied by Posner and others is the same visual attentional resource that performs the role of feature integration in Treisman's model. Subjects were cued to attend to a certain spatial location by a visual cue, and performance at expected and unexpected stimulus locations was compared. Subjects searched for a target letter (R) with distractor letters that either could give rise to illusory conjunctions (PQ) or could not (PB). Results from three separate experiments showed that orienting attention in response to central cues (endogenous orienting) showed similar effects for both conjunction and feature search. However, when attention was oriented with peripheral visual cues (exogenous orienting), conjunction search showed larger effects of attention than did feature search. It is suggested that the attentional systems that are oriented in response to central and peripheral cues may not be the same and that only the latter performs a role in feature integration. Possibilities for future research are discussed.
The behaviourist views psychology as a purely directive experimental branch of natural science. Its theoretical goal is the prediction and control of behavior. So far, human psychology has been unsuccessful due to the mistaken notion that introspection is the only method available to psychology, and that it is the study of consciousness. Actually, psychology is the study of behavior and therefore need not take recourse to conscious phenomena. Hence, animal psychology is as valid a field of study as human psychology. The laws of behavior of animals must be determined and evaluated in and for themselves, regardless of their generalizability to other animals or humans. This suggested elimination of states of consciousness as the objects of investigation will remove the barrier that exists between psychology and other natural sciences, without neglecting the essential problems of introspective psychology.
Bell System Technical Journal, also pp. 623-656 (October)
Prior research using a visual orienting paradigm has shown that spatial attention appears to play a greater role in detecting a conjunction of features than in detecting simple features (W. Prinzmetal et al, 1986; A. Treisman, 1985). However 1 study using this procedure (K. Briand and R. M. Klein; see record
1987-23943-001) reported that this pattern is obtained only when spatial attention is oriented exogenously (reflexively), not when it is oriented endogenously (voluntarily). Five experiments attempted to replicate and extend this finding of Briand and Klein while including procedures that addressed some of the criticisms directed at these aforementioned studies by Y. Tsal (1989a, 1989b). The data indicate that the findings reported by Briand and Klein were reliable and robust; spatial orienting effects were greater when the task required detection of conjunctions as opposed to features, but only when attention was directed by exogenous cues. A reason for this dissociation is proposed. (PsycINFO Database Record (c) 2012 APA, all rights reserved)
Reports on a conference held at Dalhousie University (Canada) in 1979 devoted to the subject of consciousness in contemporary psychology. Participants were drawn from philosophy, psychology, and the neurosciences. Among the issues probed were methodology in investigating conscious phenomena, definitions of consciousness, the ontogeny of the self-concept, and language functions and self-recognition in higher primates. (French abstract) (2 ref) (PsycINFO Database Record (c) 2012 APA, all rights reserved)
Presents a critical review of the feature integration theory and the studies of A. Treisman and H. Schmidt (see record
1982-07512-001); W. Prinzmetal et al (see record
1986-26854-001); and K. A. Briand and R. M. Klein (see record
1987-23943-001) and suggests that the phenomenon of illusory conjunctions does not support Treisman's theory of feature integration. I propose that the theory is too vague because it does not explicate the processes that glue features into objects and that each of the reviewed studies has suffered from methodological difficulties that leave the data open to alternative interpretations. The only solid demonstration that attention facilitates feature integration is provided by Experiment 3 of Prinzmetal et al.'s study. This finding, however, is irrelevant to the question of whether feature perception and feature integration can or cannot be performed preattentively. It may simply suggest that in addition to its effect on feature perception, attention can also influence feature integration. (PsycINFO Database Record (c) 2012 APA, all rights reserved)
Describes a unified experimental approach to the study of the mind based on experiments in the time course of human information processing. New studies on the role of intensity in information processing, on vigilance, and on orienting and detecting are presented. A historical introduction to mental chronometry together with an integration of performance and physiological techniques for its study are provided. (15 p ref) (PsycINFO Database Record (c) 2012 APA, all rights reserved)
Prominent models of attentional control assert a dichotomy between top-down and bottom-up control, with the former determined by current selection goals and the latter determined by physical salience. This theoretical dichotomy, however, fails to explain a growing number of cases in which neither current goals nor physical salience can account for strong selection biases. For example, equally salient stimuli associated with reward can capture attention, even when this contradicts current selection goals. Thus, although 'top-down' sources of bias are sometimes defined as those that are not due to physical salience, this conception conflates distinct--and sometimes contradictory--sources of selection bias. We describe an alternative framework, in which past selection history is integrated with current goals and physical salience to shape an integrated priority map.