May 2008
Volume 8, Issue 6
Free
Vision Sciences Society Annual Meeting Abstract  |   May 2008
Trading off visual acuity? Transient attention increases acuity at cued locations and decreases it at uncued locations
Author Affiliations
  • Barbara Montagna
    Department of Psychology, New York University
  • Franco Pestilli
    Department of Psychology, New York University
  • Marisa Carrasco
    Department of Psychology, New York University, and Center for Neural Science, New York University
Journal of Vision May 2008, Vol.8, 985. doi:10.1167/8.6.985
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      Barbara Montagna, Franco Pestilli, Marisa Carrasco; Trading off visual acuity? Transient attention increases acuity at cued locations and decreases it at uncued locations. Journal of Vision 2008;8(6):985. doi: 10.1167/8.6.985.

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

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Abstract

Goal: Attention trades off processing resources between attended and unattended locations. This trade-off has been shown for early visual dimensions, i.e., contrast sensitivity increases at the attended locations while decreasing at unattended locations (Pestilli & Carrasco, 2005). How general is this trade-off mechanism? Does it generalize to other basic visual dimensions? Specifically, is increased acuity at attended locations (e.g., Carrasco, Williams, Yeshurun, 2002) accompanied by a decrease in acuity at unattended locations? Here we measured the effects of attention on acuity at cued and uncued locations relative to a neutral (baseline) condition.

Methods: Transient (exogenous) attention was manipulated via non-informative peripheral cues preceding stimulus presentation. On each trial, a precue appeared either at fixation or adjacent to one of two upcoming Landolt squares. After a 60-ms SOA, the two squares (side length=1°; eccentricity=9.4°) appeared for 30-ms to the right and left of fixation. Next, a response cue indicated to the observer the target stimulus (left or right). Observers localized a gap (top or bottom) in the target Landolt square. To assess acuity, we measured 75% gap-size thresholds using an adaptive staircase procedure (Quest). When precue- and response cue-locations matched (valid trial), acuity was measured at cued locations (attended); when they mismatched (invalid trial), acuity was measured at uncued locations (unattended). On neutral trials, two precues appeared 0.5° off fixation indicating stimulus onset without drawing attention to the stimulus.

Results: Acuity increased at valid-cued locations, and decreased at uncued locations, as compared to the neutral condition. This result indicates a trade-off for acuity with transient attention, even when only two stimuli are present. This finding, analogous to that of transient attention on contrast sensitivity, suggests that visual processing trade-offs are a general mechanism of attentional allocation.

Acknowledgments: NIH R01 EY016200-01A2.

Montagna, B. Pestilli, F. Carrasco, M. (2008). Trading off visual acuity? Transient attention increases acuity at cued locations and decreases it at uncued locations [Abstract]. Journal of Vision, 8(6):985, 985a, http://journalofvision.org/8/6/985/, doi:10.1167/8.6.985. [CrossRef]
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