EEG oscillations reflect visual short-term memory processes for the change detection in human faces

Hyoung Dong Park, Byoung-Kyong Min, Kyoung M. Lee

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

People often fail to notice a large change in the visual scene when the change occurs during a brief interruption of the viewing. Since the change is well above perceptual threshold in continuous viewing, the failure (termed change blindness) has been attributed to abnormal visual short-term memory (VSTM). However, it is still unclear where the abnormality lies among the phases in VSTM, namely, encoding, maintenance, and retrieval-comparison. EEG oscillations, especially the gamma activity, have been suggested as neural signatures of VSTM, but have not been examined in the context of change blindness. Thus, we asked in the present study whether change detection or failure is correlated with EEG oscillatory activities and, if so, whether the timing and the spatial distribution of the oscillations could pin-point the abnormal phase of VSTM in change blindness. While on EEG recording, subjects watched morphed pictures of human faces in trials which consisted of a 200-ms initial image display, a 500-ms blank period, and a 200-ms comparison image display. The two images were either the same or clearly different above threshold. Trials with different images were classified as hit or missed, based on subjects' responses, and EEG data were compared between the two types of trials. Enhanced gamma activity was observed in the right temporal-parietal region during all periods in the hit trials compared to the missed ones. Frontal theta activity was increased during initial image encoding, whereas beta activity was decreased during maintenance and retrieval-comparison in the hit trials. These results point to weak encoding of initial images as the culprit for a later failure in change detection, while abnormal processing in subsequent phases of VSTM may result from the weak encoding and also contribute to change blindness.

Original languageEnglish
Pages (from-to)629-637
Number of pages9
JournalNeuroImage
Volume53
Issue number2
DOIs
Publication statusPublished - 2010 Nov 1
Externally publishedYes

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Short-Term Memory
Electroencephalography
Blindness
Maintenance
Parietal Lobe
Temporal Lobe

ASJC Scopus subject areas

  • Cognitive Neuroscience
  • Neurology

Cite this

EEG oscillations reflect visual short-term memory processes for the change detection in human faces. / Park, Hyoung Dong; Min, Byoung-Kyong; Lee, Kyoung M.

In: NeuroImage, Vol. 53, No. 2, 01.11.2010, p. 629-637.

Research output: Contribution to journalArticle

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