Jiri Lukavsky

Jiri Lukavsky
The Czech Academy of Sciences | AVCR · Institute of Psychology

PhD

About

113
Publications
43,891
Reads
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1,313
Citations
Introduction
Have you seen this? *What* do we actually remember? Interested in human visual memory - its capacity, fidelity and underlying processes.
Additional affiliations
August 2003 - present
The Czech Academy of Sciences
Position
  • Researcher

Publications

Publications (113)
Article
Full-text available
In everyday life, people often need to track moving objects. Recently, a topic of discussion has been whether people rely solely on the locations of tracked objects, or take their directions into account in multiple object tracking (MOT). In the current paper, we pose a related question: do people utilise extrapolation in their gaze behaviour, or,...
Article
In experiments investigating dynamic tasks, it is often useful to examine eye movement scan patterns. We can present trials repeatedly and compute within-subjects/conditions similarity in order to distinguish between signal and noise in gaze data. To avoid obvious repetitions of trials, filler trials must be added to the experimental protocol, resu...
Article
Full-text available
Contrary to other tasks (free viewing, recognition, visual search), participants often fail to recognize repetition of trials in multiple object tracking (MOT). This study examines the intra- and interindividual variability of eye movements in repeated MOT trials along with the adherence of eye movements to the previously described strategies. I co...
Article
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Changes in perception during space missions are usually attributed to microgravity. However, additional factors, such as spatial confinement, may contribute to changes in perception. We tested changes in scene perception using a boundary extension (BE) paradigm during a 105-day Earth-based space-simulation study. In addition to the close-up/wide-an...
Article
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Problematic internet use (PIU) has adverse effects on adolescent health. Parenting may play an important role in the prevention of this condition, but the associations between PIU and parental behavior are unknown. This meta-analysis examined the associations between adolescent PIU and general and media-specific parenting. Studies were obtained usi...
Article
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Humans can memorize and later recognize many objects and complex scenes. In this study, we prepared large photographs and presented participants with only partial views to test the fidelity of their memories. The unpresented parts of the photographs were used as a source of distractors with similar semantic and perceptual information. Additionally,...
Article
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Learning grammar requires practice and practicing grammar can be boring. We examined whether an instructional game with intrinsically integrated game mechanics promotes this practice: compared to rote learning through a quiz. We did so “in the field.” Tens of thousands children visited, in their leisure time, a public website with tens of attractiv...
Article
Functional connectivity analysis is a common approach to the characterization of brain function. While studies of functional connectivity have predominantly focused on resting‐state fMRI, naturalistic paradigms, such as movie watching, are increasingly being used. This ecologically valid, yet relatively unconstrained acquisition state has been show...
Article
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Although the Multiple Object Tracking (MOT) task is a widely used experimental method for studying divided attention, tracking objects in the real world usually looks different. For example, in the real world, objects are usually clearly distinguishable from each other and also possess different movement patterns. One such case is tracking groups o...
Preprint
In everyday life, we often view objects through a limited aperture (e.g., soccer players on TV, or cars slipping into your blind spot on a busy road), where objects often move out of view and reappear in a different place later. We modelled this situation in a series of Multiple Object Tracking experiments, where we introduced a cover on the edges...
Preprint
Although the Multiple Object Tracking (MOT) task is a widely used experimental method for studying divided attention, tracking objects in the real world usually looks different. For example, in the real world, objects are usually clearly distinguishable from each other and also possess different movement patterns. One such case is tracking groups o...
Poster
In visual memory research, recognition tasks are commonly used to query memory. However, the recent emergence of drawing as a visual free recall task has allowed for a new ability to quantify detail and content within visual memory. A still open question with these paradigms is the degree to which differences in memory performance are related to dr...
Poster
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In everyday tracking, objects often temporarily disappear from observer's view to reappear later. For instance, while driving on a busy road some cars may slip into your blind spots. In order to drive safely, you need to maintain an approximate location of the hidden cars in your memory although you cannot track them visually for a moment. Conseque...
Article
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Instructional quizzes are frequently used in educational games. When they present correct answers after learners have responded, these quizzes can be used on their own for teaching new factual and conceptual knowledge (no additional learning materials are needed). In games, these quizzes are often unrelated to gameplay: gameplay can be viewed as a...
Article
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The COVID-19 outbreak and related restrictions meant a higher incidence of screen-related risk behaviors in both children and adolescents. Our goal was to assess the perceived importance and extent of school-based preventions related to these risks during the long-term, nation-wide distant schooling period in the Czech Republic. The online survey w...
Article
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Background: Invasive treatments for atrial fibrillation (AF) pose a risk of ischemic stroke due to periprocedural brain embolization, which may be manifest or silent. The primary aim of our study was to compare the rate of silent strokes after percutaneous catheter-based and thoracoscopic epicardial ablation for AF. The secondary aim was to evaluat...
Article
People are remarkably good at remembering photographs. To further investigate the nature of the stored representations and the fidelity of human memories, it would be useful to evaluate the visual similarity of stimuli presented in experiments. Here, we explored the possible use of convolutional neural networks (CNN) as a measure of perceptual or r...
Article
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Abstrakt Článek na základě kvantitativní a kvalitativní analýz y odpovědí 9810 rodičů zkoumá vnímání vzdělává-ní v domácím prostředí z pohledu rodičů v době uzavřených základních škol z důvodu pandemie COVID-19. Cílem empirického šetření bylo odpovědět na otázky, jaké bariéry ve vzdělávání doma v době uzavřených základních škol rodiče identifikují,...
Poster
Full-text available
Many everyday-life situations require to track multiple visual object simultaneously. This encompasses situations in which it is sufficient to monitor the locations of objects (e.g., avoiding collisions in traffic) as well as situations in which the identity of the tracked objects is highly relevant (e.g. monitoring your own children on a playgroun...
Article
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Background: The initial core infarct volume predicts treatment outcome in patients with acute ischemic stroke (AIS) due to large vessel occlusion (LVO). According to the literature, CT perfusion (CTP) is able to evaluate cerebral parenchymal viability and assess the initial core in AIS. We prospectively studied whether limited-coverage CTP with au...
Article
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Schools have been closed in many countries due to the on-going COVID-19 pandemic, but education continues online. Little is known about how parents cope with educating their children in this unprecedented situation. Here, we present the results of a rapid survey examining the experience of Czech parents of children in Grades 1–9 (Age ~ 6–15; N = 9,...
Article
The attentional spatial-numerical association of response codes (Att-SNARC) effect (Fischer, Castel, Dodd, & Pratt, 2003)—the finding that participants are quicker to detect left-side targets when the targets are preceded by small numbers and quicker to detect right-side targets when they are preceded by large numbers—has been used as evidence for...
Article
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In the last years, there has been a considerable increase of research into the neuroimaging correlates of inter-individual temperament and character variability—an endeavour for which the term ‘personality neuroscience’ was coined. Among other neuroimaging modalities and approaches, substantial work focuses on functional connectivity in resting sta...
Preprint
Full-text available
Schools have been closed in many countries due to the on-going COVID-19 pandemic, but education continues online. Little is known about how parents cope with educating their children in this unprecedented situation. Here, we present the results of a rapid survey examining the experience of Czech parents of children in Grades 1-9 (Age ~ 6-15; N = 9,...
Preprint
Past research has shown that humans can memorize many objects and complex scenes. Although correct recognition of stimuli has been observed to be dependent on the distinctiveness of the presented stimuli, to what level of detail we memorize each stimulus remains an open question. In this article, we explore memory performance using visual scenes wi...
Preprint
When we are exposed to a large number of scenes, we are remarkably good at memorizing them. The precise nature of large memory capacity is still an unresolved issue. Because visual scenes involve complex stimuli, it was difficult, until recently, to evaluate the similarity of two scenes. Researchers required a crucial manipulation check to decode t...
Article
The present research was motivated by the routine digital media practice of producing page layouts as composite images that include several unrelated pictures. We investigated whether or how visually highlighting affective and positional components of pictures in a viewer’s field of vision might influence viewer perception and evaluation of the com...
Article
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Lay Description What is already known about this topic Anthropomorphizing graphical elements in multimedia learning materials (e.g., by adding eyes) generally enhances learning. This could be due to increased motivation or due to effects of the anthropomorphisms on attention distribution. Only one study has used eye tracking to test attention distr...
Article
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Cognitive performance is dynamic and shaped by individual biological and environmental factors throughout life. In psychology, besides the effects of age, education, and other often studied factors, the complexity of the lived-in environment and urbanicity in that context are yet to be elucidated. In this observational cross-sectional study, we com...
Article
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Humans display a very good understanding of the content in briefly presented photographs. To achieve this understanding, humans rely on information from both high-acuity central vision and peripheral vision. Previous studies have investigated the relative contribution of central and peripheral vision. However, the role of attention in this task rem...
Preprint
In boundary extension (BE), people memorize an image and later they falsely claim seeing content beyond the image boundaries. However, the content near image boundaries is likely to be uninteresting, serving as a background for a central figure.In our experiments, we presented people with 24 photographs with a defect (cut-out hole or black ink blot...
Article
Background: Gadolinium brain deposits after intravenous application of gadolinium-based contrast agents (GBCA) have been recently reported. Aim: We focused selectively on gadoxetate disodium, a hepatospecific linear GBCA. There are currently only a few studies in peer-reviewed literature focused selectively on gadoxetate disodium with conflictin...
Article
Beck Depression Inventory-II (BDI-II) is one of the most-used rating scales. It was developed as a tool administered either as a self-rating or interview-based, observer-rating scale. Objective The goal of this study is to compare BDI-II scores obtained with two standard methods of administration in community-based older persons. Methods BDI-II w...
Conference Paper
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In the contexts of digital game-based and multimedia learning, little is known about the strengths of associations between positive affective-motivational factors elicited during a study session and the quality of knowledge acquisition. Here, we take a step forward in filling this gap by re-analyzing our 11 experiments carried out between 2009-2017...
Conference Paper
In every quantitative eye tracking research study, researchers need to compare eye movements between subjects or conditions. For both static and dynamic tasks, there is a variety of metrics that could serve this purpose. It is important to explore the robustness of the metrics with respect to artificial noise. For dynamic tasks, where eye movement...
Preprint
Humans display a very good understanding of the content in briefly presented photographs. To achieve this understanding, humans rely on information from both high-acuity central vision and peripheral vision. Previous studies have investigated the relative contribution of central/peripheral vision. However, the role of attention in this task remains...
Article
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In response to recommendations to redefine statistical significance to P ≤ 0.005, we propose that researchers should transparently report and justify all choices they make when designing a study, including the alpha level.
Article
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In response to recommendations to redefine statistical significance to P ≤ 0.005, we propose that researchers should transparently report and justify all choices they make when designing a study, including the alpha level.
Article
Concern about postoperative worsening of cognitive functions after temporal lobe epilepsy surgery is an important issue. In this article we review our data on neuropsychological outcome after radiofrequency (RF) ablation of amygdalohippocampal complex (AHC). On a group level we found initial improvement in intelligence domains and unchanged memory...
Preprint
Full-text available
In response to recommendations to redefine statistical significance to p ≤ .005, we propose that researchers should transparently report and justify all choices they make when designing a study, including the alpha level.
Poster
Full-text available
People can recognize the content of a real-world scene (gist) within a single fixation. This ability is not limited to the central vision. Larson et al. (2014) showed how retinal eccentricity affects the time course of the gist acquisition. Here, we tested how allocating attention affects gist acquisition in central vision and in periphery. We pres...
Article
Previous studies have demonstrated that humans have a remarkable capacity to memorise a large number of scenes. The research on memorability has shown that memory performance can be predicted by the content of an image. We explored how remembering an image is affected by the image properties within the context of the reference set, including the ex...
Article
Purpose: To assess the neuropsychological performance recoded over a period of 5 years after stereotactic radiofrequency amygdalohippocampectomy (SAHE) in the treatment of mesial temporal lobe epilepsy. Material and methods: Thirty patients (mean age 38 years, 14 females/16 males) were included in this study. Twenty-one patients were treated on...
Article
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We have recently shown in Finnish speakers that articulation of certain vowels and consonants has a systematic influence on simultaneous grasp actions as well as on forward and backward hand movements. Here we studied whether these effects generalize to another language, namely Czech. We reasoned that if the results generalized to another language...
Conference Paper
Adding anthropomorphic graphical elements to computerized learning materials has been shown to enhance learning. We have prepared an experimental study, in which we will investigate if learning is enhanced because of the elevated positive affect of learners or due to the attention-capturing effect of the anthropomorphisms. Here, we present a pilot...
Conference Paper
Full-text available
Purpose: To assess memory performance and effect of stereotactic radiofrequency amygdalohippocampectomy (SAHE) in the treatment of mesial temporal lobe epilepsy (MTLE)
Article
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Previous studies have shown congruency effects between specific speech articulations and manual grasping actions. For example, uttering the syllable [kɑ] facilitates power grip responses in terms of reaction time and response accuracy. A similar association of the syllable [ti] with precision grip has also been observed. As these congruency effects...
Article
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Objective: Cognitive tests are used repeatedly to assess the treatment response or progression of cognitive disorders. The Montreal Cognitive Assessment (MoCA) is a valid screening test for mild cognitive impairment. The aim of our study was to establish 90% reliable change indices (RCI) for the MoCA together with the Mini-Mental State Examination...
Article
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Objective: The aim of our study was to determine the strength of individual items in the Montreal Cognitive Assessment (MoCA) and then develop a short screening tool consisting of 2 items to detect subnormal cognitive performance based on the MoCA. Sample and Methods: The sample consisted of 540 cognitively healthy individuals 60 and more years ol...
Article
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The principal aim of our study was to present norms for old and very old Czech adults on the Czech version of the Montreal Cognitive Assessment (MoCA). We analyzed 540 adults aged ≥ 60 years (4-year age categories; nationally representative sample in terms of sex and educational level), who met strict inclusion criteria for the absence of neurodege...
Conference Paper
In typical Multiple Object Tracking (MOT) paradigm, the participant's task is to track targets amongst distractors for several seconds. Understanding gaze strategies in MOT can help us reveal attentional mechanisms in dynamic tasks. Previous attempts relied on analytical strategies (such as averaging object positions). An alternative approach is to...
Article
Full-text available
Background and purpose: Mesial temporal structures play an important role in human memory. In mesial temporal lobe epilepsy (MTLE), seizure activity is generated from the same structures. Surgery is the definitive treatment for medically intractable MTLE. In addition to standard temporal lobe microsurgical resection, stereotactic radiofrequency am...
Article
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The aim of this study was to provide normative data for older and very old Czech adults on the Prague Stroop Test (PST) and to test its discriminative validity in individuals with Parkinson's disease mild cognitive impairment (PD-MCI). The construction of the PST was modeled after the Victoria Stroop Test. We examined 539 participants aged 60-96 th...
Article
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Aim: The Rey-Osterrieth Complex Figure Test (ROCFT) is a widely used measure of memory functioning and visuoconstructive abilities. It is considered to be a sensitive diagnostic tool for the evolution of cognitive impairment. The aim of the present study was to determine the normative values for the ROCFT in a population of older Czech adults. Samp...
Article
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Previous studies showed a remarkable capacity to memorize large number of scenes (Konkle et al., 2010). Same study showed exemplar effect (higher number of exemplars per category led to decreased performance). Can images of similar gist from different categories also impair the performance? Alternatively, people are trained to deal with these simil...
Article
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National Normative Study of Cognitive Determinants of Healthy Ageing (NANOK) at the National Institute of Mental Health, which is a successor of Prague Psychiatric Center, in 2012-2015 is, as we know, the first longitudinal project in the Czech Republic focusing on cognitive abilities in healthy older population.
Article
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Aim The “time perspective” becomes increasingly relevant in psychological assessment, but time constraints sometimes prevent the use of the popular Zimbardo Time Perspective Inventory (ZTPI) in its full extent. This study focuses on short versions (ZTPI–short), comprising 3 items for each scale, 15 items in total (18 when Future-Negative is added)....
Article
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During everyday tasks, people often have to focus on several objects at once. As eye movements and attention are closely related, modeling eye movements can help us understand, where people attend to. In this study, we conducted an experiment in which participants had to track several moving objects at once while their eye gaze is being measured. W...
Article
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Aim: The aim of this normative study of Mini-Mental State Examination (MMSE) - a neuropsychological method to screen cognitive status and disorders - is to confirm international findings on the effects of age and education on MMSE scores and to obtain normative data for the Czech older population. Sample and methods: The sample consisted of 540 adu...
Article
Full-text available
Background: Surgical therapy of intractable mesial temporal lobe epilepsy (MTLE) is an effective and well-established treatment. Objectives: We compared two different surgical approaches, standard microsurgical anterior temporal resection (ATL) and stereotactic radiofrequency amygdalohippocampectomy (SAHE) for MTLE, with respect to the extent of...
Conference Paper
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Abstract: The published studies show a relation between the region (eg. rural versus big city) and performances in some neuropsychological tests. Our goal is to determine whether the different performances of older persons in standard cognitive screening tests, depending on the region in the Czech Republic. We matched 96 people living in the capita...
Article
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The aim of the present study was to assess the validity of a 12-word Czech version of the Philadelphia (repeatable) Verbal Learning Test [czP(r)VLT-12]. The construction of the czP(r)VLT-12 was modeled after the California Verbal Learning Test (CVLT) and the nine-word Philadelphia (repeatable) Verbal Learning Test [P(r)VLT]. The czP(r)VLT-12 was co...
Article
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There is accumulating evidence that training on working memory (WM) generalizes to other nontrained domains, and there are reports of transfer effects extending as far as to measures of fluid intelligence. Although there have been several demonstrations of such transfer effects in young adults and children, they have been difficult to demonstrate i...