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

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journal contribution
posted on 11.03.2014, 14:53 by Lisandro N. Kaunitz, Juan E. Kamienkowski, Alexander Varatharajah, Mariano Sigman, Rodrigo Quian Quiroga, Matias J. Ison
Despite the compelling contribution of the study of event related potentials (ERPs) and eye movements to cognitive neuroscience, these two approaches have largely evolved independently. We designed an eye-movement visual search paradigm that allowed us to concurrently record EEG and eye movements while subjects were asked to find a hidden target face in a crowded scene with distractor faces. Fixation event-related potentials (fERPs) to target and distractor stimuli showed the emergence of robust sensory components associated with the perception of stimuli and cognitive components associated with the detection of target faces. We compared those components with the ones obtained in a control task at fixation: qualitative similarities as well as differences in terms of scalp topography and latency emerged between the two. By using single trial analyses, fixations to target and distractors could be decoded from the EEG signals above chance level in 11 out of 12 subjects. Our results show that EEG signatures related to cognitive behavior develop across spatially unconstrained exploration of natural scenes and provide a first step towards understanding the mechanisms of target detection during natural search.

Funding

EPSRC (EP/I016899/1)

History

Citation

NeuroImage, 2014, 89, pp. 297-305

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Engineering

Version

VoR (Version of Record)

Published in

NeuroImage

Publisher

Elsevier on behalf of Academic Press

issn

1053-8119

eissn

1095-9572

Copyright date

2013

Available date

11/03/2014

Publisher version

http://www.sciencedirect.com/science/article/pii/S105381191301210X

Language

en

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