scholarly journals Distinguishing between target and nontarget fixations in a visual search task using fixation-related potentials

2013 ◽  
Vol 13 (3) ◽  
pp. 17-17 ◽  
Author(s):  
A.-M. Brouwer ◽  
B. Reuderink ◽  
J. Vincent ◽  
M. A. J. van Gerven ◽  
J. B. F. van Erp
Keyword(s):  
Visual Search ◽  
Search Task ◽  
Visual Search Task ◽  
Related Potentials

Intermodal Compensatory Effects in a Visual Search Task with Congenitally Deaf Adults

Perception ◽  
1996 ◽  
Vol 25 (1_suppl) ◽  
pp. 147-147
Author(s):  
P Stivalet ◽  
Y Moreno ◽  
C Cian ◽  
J Richard ◽  
P-A Barraud
Keyword(s):  
New York ◽  
Visual Search ◽  
Search Task ◽  
Visual Search Task ◽  
Event Related Potentials ◽  
Normal Subjects ◽  
Stimulus Onset ◽  
Search Pattern ◽  
York Academy ◽  
Related Potentials

In a visual search paradigm we measured the stimulus onset asynchrony (SOA) between a stimulus and a mask that was required to reach 90% correct responses. This procedure has the advantage of taking into account the real processing time and excluding the time for the generation of the motor response. Twelve congenitally deaf adult subjects and twelve normal subjects were given a visual search task for a target letter O among a varying number of distractor letters Q and vice-versa. In both groups we found the asymmetrical visual search pattern classically observed with parallel processing for the search for the target Q and with serial processing for the search for the target O (Treisman, 1985 Computer Vision, Graphics, and Image Processing31 156 – 177). The difference between the mean search slopes for an O target was not statistically significant between the groups; this might be due to the variability within the groups. The visual search amidst the congenitally deaf does not seem to benefit from a compensatory effect in relation to the acoustic deprivation. Our results seem to confirm data reported by Neville (1990 Annals of the New York Academy of Science 71 – 91) obtained by an electrophysiological technique based on event-related potentials. Nevertheless, the deaf subjects were 2.5 times faster at the visual search task.

scholarly journals Looking for a face in the crowd: Fixation-related potentials in an eye-movement visual search task

NeuroImage ◽  
2014 ◽  
Vol 89 ◽  
pp. 297-305 ◽  
Author(s):  
Lisandro N. Kaunitz ◽  
Juan E. Kamienkowski ◽  
Alexander Varatharajah ◽  
Mariano Sigman ◽  
Rodrigo Quian Quiroga ◽  
...  
Keyword(s):  
Visual Search ◽  
Eye Movement ◽  
Search Task ◽  
Visual Search Task ◽  
Related Potentials

scholarly journals Neural Correlates of Changes in a Visual Search Task due to Cognitive Training in Seniors

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Nele Wild-Wall ◽  
Michael Falkenstein ◽  
Patrick D. Gajewski
Keyword(s):  
Visual Search ◽  
Cognitive Training ◽  
Search Task ◽  
Visual Search Task ◽  
Event Related Potentials ◽  
Training Group ◽  
Cognitive Intervention ◽  
Repetition Effects ◽  
Feature Processing ◽  
Related Potentials

This study aimed to elucidate the underlying neural sources of near transfer after a multidomain cognitive training in older participants in a visual search task. Participants were randomly assigned to a social control, a no-contact control and a training group, receiving a 4-month paper-pencil and PC-based trainer guided cognitive intervention. All participants were tested in a before and after session with a conjunction visual search task. Performance and event-related potentials (ERPs) suggest that the cognitive training improved feature processing of the stimuli which was expressed in an increased rate of target detection compared to the control groups. This was paralleled by enhanced amplitudes of the frontal P2 in the ERP and by higher activation in lingual and parahippocampal brain areas which are discussed to support visual feature processing. Enhanced N1 and N2 potentials in the ERP for nontarget stimuli after cognitive training additionally suggest improved attention and subsequent processing of arrays which were not immediately recognized as targets. Possible test repetition effects were confined to processes of stimulus categorisation as suggested by the P3b potential. The results show neurocognitive plasticity in aging after a broad cognitive training and allow pinpointing the functional loci of effects induced by cognitive training.

scholarly journals On the Origin of Event-Related Potentials Indexing Covert Attentional Selection During Visual Search

2009 ◽  
Vol 102 (4) ◽  
pp. 2375-2386 ◽  
Author(s):  
Jeremiah Y. Cohen ◽  
Richard P. Heitz ◽  
Jeffrey D. Schall ◽  
Geoffrey F. Woodman
Keyword(s):  
Visual Search ◽  
Search Task ◽  
Visual Search Task ◽  
Event Related Potentials ◽  
Frontal Eye Field ◽  
Field Potentials ◽  
Electrophysiological Studies ◽  
Human Experiments ◽  
Related Potentials ◽  
Eye Field

Despite nearly a century of electrophysiological studies recording extracranially from humans and intracranially from monkeys, the neural generators of nearly all human event-related potentials (ERPs) have not been definitively localized. We recorded an attention-related ERP component, known as the N2pc, simultaneously with intracranial spikes and local field potentials (LFPs) in macaques to test the hypothesis that an attentional-control structure, the frontal eye field (FEF), contributed to the generation of the macaque homologue of the N2pc (m-N2pc). While macaques performed a difficult visual search task, the search target was selected earliest by spikes from single FEF neurons, later by FEF LFPs, and latest by the m-N2pc. This neurochronometric comparison provides an empirical bridge connecting macaque and human experiments and a step toward localizing the neural generator of this important attention-related ERP component.

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