August 2014
Volume 14, Issue 10
Vision Sciences Society Annual Meeting Abstract  |   August 2014
The effect of biased competition within sequential displays on visual short-term memory
Author Affiliations
  • Claire E. Miller
    School of Psychology, Bangor University
  • Niklas Ihssen
    School of Psychology, Cardiff University
  • David E. J. Linden
    School of Psychology, Cardiff University
  • Kimron L. Shapiro
    School of Psychology, University of Birmingham
Journal of Vision August 2014, Vol.14, 166. doi:
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      Claire E. Miller, Niklas Ihssen, David E. J. Linden, Kimron L. Shapiro; The effect of biased competition within sequential displays on visual short-term memory. Journal of Vision 2014;14(10):166.

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      © ARVO (1962-2015); The Authors (2016-present)

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Much has been discovered about the properties of visual short-term memory (VSTM), but few mechanisms have been proposed to explain limitations such as its low maximum capacity (Luck & Vogel, 1997). One mechanism suggested to account for this outcome is that of biased competition (Desimone & Duncan, 1995), with growing evidence suggesting that increasing competition in early visual areas may result in fewer stimulus items being successfully recalled (Shapiro & Miller, 2011). It has previously been shown that VSTM performance on a change detection task can be enhanced by reducing competition, through dividing the to-be-remembered items into two sequential displays (Ihssen, Linden & Shapiro, 2010). However, the episodic nature of the sequential displays may also have benefitted VSTM (see Bowman & Wyble, 2007). The present study provides further support for the biased competition account by manipulating competition whilst holding constant the number of episodes in which the stimuli were presented. Using a modified change-detection task the ratio of items between two displays was varied between n : n (the same number of items in each display) and n : n+/-3 (three more items in one display), for displays of both low (4-5 items) and high set size (7-8 items). We found significantly higher k-values for the near ratios (n : n and n : n+/-1) than the far (n : n+/-2 and n : n+/-3). There was no significant main effect of set size, nor interaction. These results provide compelling evidence that inter-stimulus competition plays a role in VSTM.

Meeting abstract presented at VSS 2014


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