December 2001
Volume 1, Issue 3
Free
Vision Sciences Society Annual Meeting Abstract  |   December 2001
The effects of attention in texture segmentation in the lower and upper visual fields
Author Affiliations
  • C. P. Talgar
    Department of Psychology, New York University, New York, NY, USA
  • M. Carrasco
    Department of Psychology, New York University, New York, NY, USA
Journal of Vision December 2001, Vol.1, 76. doi:10.1167/1.3.76
  • Views
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      C. P. Talgar, M. Carrasco; The effects of attention in texture segmentation in the lower and upper visual fields. Journal of Vision 2001;1(3):76. doi: 10.1167/1.3.76.

      Download citation file:


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

      ×
  • Supplements
Abstract

Introduction: This study is based on two findings: 1) In a texture segmentation task, attending to the target location improved performance where the resolution is too low (periphery) but impaired it where resolution is already too high (central locations) for the task. These results indicate an enhanced spatial resolution at the attended location (Yeshurun & Carrasco, 1998). 2) In some tasks, performance is better across the horizontal than the vertical meridian -horizontal vertical anisotropy- and in the lower than upper region of the vertical meridian -vertical meridian asymmetry (VMA). Whereas some attribute this “performance field” to attentional effects, Carrasco, Talgar & Cameron (in press) showed that although transient attention enhances overall contrast sensitivity, the shape of the performance field does not change — performance fields are determined by visual factors. Goal: Is there a VMA for spatial resolution? At equal eccentricities, does attention enhance spatial resolution to the same degree in the upper and lower regions of the vertical meridian? Methods: In a texture segmentation task where performance peaks at mid-peripheral locations, the central performance drop is attributed to the spatial filters at the fovea being too small for the scale of the texture. In a 2IFC task observers were presented with a cue that either indicated the time of target onset (neutral cue: 50% of trials) or indicated both time and location of target onset (peripheral cue: 50% of trials). The target patch appeared at varying eccentricities in a large texture pattern along the vertical meridian. Results: 1) The central performance drop was larger and performance peaked at farther eccentricities in the lower than upper visual field. 2) Attention affected the visual field uniformly. Conclusion: Resolution was higher in the lower half of the vertical meridian. The degree of enhanced resolution brought about by transient attention was constant along the vertical meridian.

NSF 99-10734.

Talgar, C.P., Carrasco, M.(2001). The effects of attention in texture segmentation in the lower and upper visual fields [Abstract]. Journal of Vision, 1( 3): 76, 76a, http://journalofvision.org/1/3/76/, doi:10.1167/1.3.76. [CrossRef]
×
×

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.

×