August 2009
Volume 9, Issue 8
Free
Vision Sciences Society Annual Meeting Abstract  |   August 2009
The interactive nature of multiple stimulus representations in visual-short term memory
Author Affiliations
  • Eunsam Shin
    Psychological Sciences, University of Missouri
  • Monica Fabiani
    Psychology, University of Illinois at Urbana-Champaign
  • Gabriele Gratton
    Psychology, University of Illinois at Urbana-Champaign
Journal of Vision August 2009, Vol.9, 600. doi:10.1167/9.8.600
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      Eunsam Shin, Monica Fabiani, Gabriele Gratton; The interactive nature of multiple stimulus representations in visual-short term memory. Journal of Vision 2009;9(8):600. doi: 10.1167/9.8.600.

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Abstract

Previously we found sequential deflections of encoding-related lateralization (ERL) waveforms in event-related brain potentials, suggesting that multiple levels of stimulus representation activate in different time windows (Shin, Fabiani, & Gratton, 2006). The ERLs reflect lateralized brain activities elicited by the degree of matching or mismatching between laterally-presented memory-sets and centrally-presented probes. Here we further investigated the nature of one of the ERLs (reported in Shin et al., 2006), showing a smaller ERL in the set-size 4 than in the set-size 2 condition, observed about 400 ms poststimulus at posterior electrode sites. Twenty participants performed a memory search task, in which a memory-set of homogeneous or heterogeneous letters with two letters in each hemifield and a two-letter probe in the center were presented in sequence. To test local suppression hypothesis, we varied distances of memory-set letters (close vs. far) but kept eccentricity of the letters from fixation constant. To test partial matching hypothesis, we presented probe letters completely or partially matching to the memory-set items. Data showed that the ERL was larger (a) in the complete-match than in the partial-match condition at all times; (b) in the far than in the close condition for the heterogeneous memory-set letters; (c) in the close than in the far condition for the homogeneous memory-set letters. These results support both local suppression and partial matching hypotheses, indicating that stimuli are represented in an interactive way and activation of the representations is maximized at a complete match of probe with memory representation. Also, perceptual grouping influences memory representations and their activations.

Shin, E. Fabiani, M. Gratton, G. (2009). The interactive nature of multiple stimulus representations in visual-short term memory [Abstract]. Journal of Vision, 9(8):600, 600a, http://journalofvision.org/9/8/600/, doi:10.1167/9.8.600. [CrossRef]
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