Open AccessFixation-related potentials in visual search: A combined EEG and eye tracking study
Author(s) -
Juan E. Kamienkowski,
Matias J. Ison,
Rodrigo Quian Quiroga,
Mariano Sigman
Publication year - 2012
Publication title -
journal of vision
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.126
H-Index - 113
ISSN - 1534-7362
DOI - 10.1167/12.7.4
Subject(s) - fixation (population genetics) , electroencephalography , eye movement , computer science , eye tracking , artificial intelligence , visual search , computer vision , communication , pattern recognition (psychology) , neuroscience , psychology , biology , biochemistry , gene
We report a study of concurrent eye movements and electroencephalographic (EEG) recordings while subjects freely explored a search array looking for hidden targets. We describe a sequence of fixation-event related potentials (fERPs) that unfolds during ∼ 400 ms following each fixation. This sequence highly resembles the event-related responses in a replay experiment, in which subjects kept fixation while a sequence of images occurred around the fovea simulating the spatial and temporal patterns during the free viewing experiment. Similar responses were also observed in a second control experiment where the appearance of stimuli was controlled by the experimenters and presented at the center of the screen. We also observed a relatively early component (∼150 ms) that distinguished between targets and distractors only in the freeviewing condition. We present a novel approach to match the critical properties of two conditions (targets/distractors), which can be readily adapted to other paradigms to investigate EEG components during free eye-movements.Peer-reviewed10449
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