September 2011
Volume 11, Issue 11
Free
Vision Sciences Society Annual Meeting Abstract  |   September 2011
Sustained attention facilitates change detection, but only in a brief blank duration
Author Affiliations
  • Ryoichi Nakashima
    The University of Tokyo, Japan
  • Kazuhiko Yokosawa
    The University of Tokyo, Japan
Journal of Vision September 2011, Vol.11, 147. doi:10.1167/11.11.147
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      Ryoichi Nakashima, Kazuhiko Yokosawa; Sustained attention facilitates change detection, but only in a brief blank duration. Journal of Vision 2011;11(11):147. doi: 10.1167/11.11.147.

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

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Abstract

In a normal change-detection task, observers should encode a study image, retain its representation for a time interval, retrieve this representation and compare it with a test image. Many studies indicate that attention is not necessary for retention of a representation, whereas it is essential for encoding and retrieving a representation (e.g., Hollingworth, 2003). In normal change-detection tasks, however, multiple objects are presented within study and test images, making it difficult to examine sustained attention on a single target object. Therefore, the role of sustained attention in change-detection tasks remains unclear. To examine this issue, we conducted an object orientation change-detection task, manipulating an object location between study and test displays (same or different location). Use of a single object should ensure focal attention to that object. In Experiment 1, a study image was presented for 500-ms, and ISI differed (200-ms or 1000-ms). We hypothesized that location shifts require corresponding shifts in spatial attention to the new location, hence should interfere with change-detection. However, location shifts interfered with change-detection performance only in 200-ms condition. Further, in the same location condition, performance was higher in the 200-ms condition than in the 1000-ms condition. In Experiment 2, using a 200-ms ISI, we manipulated the SOA between study and test images (700-ms or 1500-ms) and object location. In this experiment, performance was better for the same (versus different) locations in both SOA conditions. These data are consistent with a suggestion that spatial attention is sustained for a short time interval (Nakashima & Yokosawa, 2010, VSS); they further imply that this time interval is determined by the ISI and not by the SOA. That is, focused attention on an object region is sustained over a subsequent short blank time interval and this facilitates change detection.

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