Purchase this article with an account.
Wendy J Adams, Tomas HJ Knapen, Erich W Graf, Jan W Brascamp; Effects of spatial attention on motion aftereffects.. Journal of Vision 2013;13(9):378. doi: https://doi.org/10.1167/13.9.378.
Download citation file:
© ARVO (1962-2015); The Authors (2016-present)
We addressed two questions relating to motion and attention: Firstly, is motion adaptation greater when attention is directed toward a peripheral adaptation stimulus, rather than directed to a central, motion-irrelevant stimulus? Secondly, is attention required to produce colour-contingent motion aftereffects (MAEs)? Although attention has previously been found to boost the MAE (e.g. Chaudhuri, 1990; Taya, Adams, Graf & Lavie, 2009; Kaunitz, Fracasso & Melcher, 2011), the validity of these findings has recently been questioned (Morgan, 2011, 2012). Additionally, recent work suggests that when motion and colour are misbound to produce an illusory colour-motion conjunction (as in Wu, Kanai & Shimojo, 2004) the resultant colour-contingent MAE depends on the perceived, rather than the actual contingency (Zhang & Fang, 2012, although see Blaser, Papathomas & Vidnyánszky, 2005). This result suggests that colour-motion binding may not be early and automatic, and may thus depend on attention. In the present study, observers viewed an annulus of isoluminant red and / or blue dots that moved coherently to produce clockwise or anti-clockwise motion. While this adaptation stimulus was present, observers either: (i) counted brief periods of increased motion speed, or (ii) counted light vowels amongst a stream of centrally presented light and dark letters. The difficulty of these two tasks was modulated online to maintain 75% correct performance. The resultant MAEs were quantified with test stimuli composed of red or blue dots using a nulling, staircase procedure. In agreement with previous reports, directing spatial attention to the peripheral motion stimulus increased the MAE. However, colour-contingent MAEs were observed in both the motion and letter task conditions, supporting the notion that binding of colour and motion occurs automatically.
Meeting abstract presented at VSS 2013
This PDF is available to Subscribers Only