August 2014
Volume 14, Issue 10
Free
Vision Sciences Society Annual Meeting Abstract  |   August 2014
Individual differences in visual working memory capacity and search efficiency may predict distinct strategic processes for dot arrays by numerosity comparison sensitivity
Author Affiliations
  • Giyeon Kim
    Department of Psychology, Chung-Ang University
  • Soohyun Cho
    Department of Psychology, Chung-Ang University
  • Joo-Seok Hyun
    Department of Psychology, Chung-Ang University
Journal of Vision August 2014, Vol.14, 548. doi:10.1167/14.10.548
  • Views
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      Giyeon Kim, Soohyun Cho, Joo-Seok Hyun; Individual differences in visual working memory capacity and search efficiency may predict distinct strategic processes for dot arrays by numerosity comparison sensitivity. Journal of Vision 2014;14(10):548. doi: 10.1167/14.10.548.

      Download citation file:


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

      ×
  • Supplements
Abstract

Numerosity comparison, the ability to compare quantities of two arrays of elements, is assumed to be as important to human mathematical ability as attention and working memory presumably are important. Accordingly, we attempted to explore the relationship of an individual's sensitivity to numerosity differences with their visual working memory (VWM) capacity and visual search efficiency. First, we measured the participant's VWM capacity using a color-change detection task (i.e., Cowan's K), and their search efficiencies (i.e., search slope). We then measured their numerosity comparison sensitivities in several tasks, that required comparing the quantities of two sequential (200ms each) or bilateral arrays (200ms). The dots were places either at identical locations (i.e., fixed-position) or random (i.e., scrambled-position) across the arrays, while the ratio for their quantities varied across trials. Each participant's comparison sensitivity(termed alpha [α]) for numerosity was defined as a 75%-accuracy threshold on a modeled logistic function. This function demonstrated a sigmoidal pattern of accuracies along the incremental quantity difference between the arrays, such that a lower alpha indicated higher sensitivity. The analyses for the sequential array trials found a negative correlation between Cowan's Ks and alphas in the fixed-position condition, and a positive correlation between search slopes and alphas in the scrambled-position condition. These results indicated that the participants used a strategy to exploit VWM capacity only if they were able to store the array as a global image, while they used a strategy to exploit a rapid shift of attention if they were unable to. However the analyses for the bilateral array trials found no correlations, indicating neither the strategy was possible due to the doubled array size and the brief exposure duration. These suggest that an individual's numerosity comparison sensitivity can be predicted by his or her VWM capacity and search efficiency.

Meeting abstract presented at VSS 2014

×
×

This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.

×