INVESTIGADORES
KAMIENKOWSKI Juan Esteban
artículos
Título:
Looking for a face in the crowd: fixation-related potentials in an eye-movement visual search task
Autor/es:
LISANDRO N KAUNITZ; JUAN E KAMIENKOWSKI; ALEXANDER VARATHARAJAH ; MARIANO SIGMAN; RODRIGO QUIAN QUIROGA; MATIAS J ISON
Revista:
NEUROIMAGE.
Editorial:
ACADEMIC PRESS INC ELSEVIER SCIENCE
Referencias:
Año: 2014 vol. 89 p. 297 - 305
ISSN:
1053-8119
Resumen:
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.