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Parsing a mental program: Fixation-related brain signatures of unitary operations and routines in natural visual search.
Kamienkowski, Juan E; Varatharajah, Alexander; Sigman, Mariano; Ison, Matias J.
Afiliación
  • Kamienkowski JE; Laboratory of Applied Artificial Intelligence, Computer Science Institute, School of Exact and Natural Science, University of Buenos Aires - National Council of Science and Technology, Buenos Aires, Argentina; Physics Department, School of Exact and Natural Science, University of Buenos Aires, Bueno
  • Varatharajah A; Department of Engineering, University of Leicester, Leicester, United Kingdom.
  • Sigman M; Torcuato Di Tella University, Buenos Aires, Argentina.
  • Ison MJ; School of Psychology, University of Nottingham, Nottingham, United Kingdom. Electronic address: Matias.Ison@nottingham.ac.uk.
Neuroimage ; 183: 73-86, 2018 12.
Article en En | MEDLINE | ID: mdl-30096368
Visual search involves a sequence or routine of unitary operations (i.e. fixations) embedded in a larger mental global program. The process can indeed be seen as a program based on a while loop (while the target is not found), a conditional construct (whether the target is matched or not based on specific recognition algorithms) and a decision making step to determine the position of the next searched location based on existent evidence. Recent developments in our ability to co-register brain scalp potentials (EEG) during free eye movements has allowed investigating brain responses related to fixations (fixation-Related Potentials; fERPs), including the identification of sensory and cognitive local EEG components linked to individual fixations. However, the way in which the mental program guiding the search unfolds has not yet been investigated. We performed an EEG and eye tracking co-registration experiment in which participants searched for a target face in natural images of crowds. Here we show how unitary steps of the program are encoded by specific local target detection signatures and how the positioning of each unitary operation within the global search program can be pinpointed by changes in the EEG signal amplitude as well as the signal power in different frequency bands. By simultaneously studying brain signatures of unitary operations and those occurring during the sequence of fixations, our study sheds light into how local and global properties are combined in implementing visual routines in natural tasks.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Atención / Percepción Espacial / Corteza Cerebral / Electroencefalografía / Potenciales Evocados / Movimientos Oculares / Medidas del Movimiento Ocular / Reconocimiento Facial Límite: Adult / Female / Humans / Male Idioma: En Revista: Neuroimage Asunto de la revista: DIAGNOSTICO POR IMAGEM Año: 2018 Tipo del documento: Article Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
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XML
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Atención / Percepción Espacial / Corteza Cerebral / Electroencefalografía / Potenciales Evocados / Movimientos Oculares / Medidas del Movimiento Ocular / Reconocimiento Facial Límite: Adult / Female / Humans / Male Idioma: En Revista: Neuroimage Asunto de la revista: DIAGNOSTICO POR IMAGEM Año: 2018 Tipo del documento: Article Pais de publicación: Estados Unidos