Competitive interactions affect working memory performance for both simultaneous and sequential stimulus presentation

Jumana Ahmad, Garrett Swan, Howard Bowman, Brad Wyble, Anna Nobre, Kimron Shapiro, Fiona McNab

Research output: Contribution to journalArticlepeer-review

Abstract

Competition between simultaneously presented visual stimuli lengthens reaction time and reduces both the BOLD response and neural firing. In contrast, conditions of sequential presentation have been assumed to be free from competition. Here we manipulated the spatial proximity of stimuli (Near versus Far conditions) to examine the effects of simultaneous and sequential competition on different measures of working memory (WM) for colour. With simultaneous presentation, the measure of WM precision was significantly lower for Near items, and participants reported the colour of the wrong item more often. These effects were preserved when the second stimulus immediately followed the first, disappeared when they were separated by 500ms, and were partly recovered (evident for our measure of mis-binding but not WM precision) when the task was altered to encourage participants to maintain the sequentially presented items together in WM. Our results show, for the first time, that competition affects the measure of WM precision, and challenge the assumption that sequential presentation removes competition.
Original languageEnglish
Pages (from-to)1-16
Number of pages16
JournalScientific Reports
Volume7
Issue number4785
Early online date6 Jul 2017
DOIs
Publication statusE-pub ahead of print - 6 Jul 2017

Bibliographical note

© The Author(s) 2017

Keywords

  • Competition
  • Working Memory
  • Crowding
  • Proximity

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