Purchase this article with an account.
Wanghaoming Fang, Mark Becker, Taosheng Liu; Surround Suppression in Feature-based Attention to Color. Journal of Vision 2017;17(10):49. doi: 10.1167/17.10.49.
Download citation file:
© ARVO (1962-2015); The Authors (2016-present)
Goal. Feature-based attention can enhance perception to an attended color. However, it is less clear how attending to a color modulates processing of nearby colors. The feature-similarity gain model predicts a graded level of attentional enhancement centered on the attended color. However, a center-surround mechanism claims inhibition of colors nearby the attended one (Stormer & Alvarez, 2014). Here, we investigate how attentional modulation varies systematically as a function of the difference between the stimulus color and the attended color. Methods. Subjects were sequentially presented with two intervals, with each interval consisting of a patch of static colored dots. In one patch all dots had random colors, while in the other patch one color was overrepresented (the target). Subjects performed a 2IFC task reporting the interval that contained the target. The amount of overrepresentation was determined by interleaved staircases for each target color and each subject in a thresholding session at the start of the experiment. In the cueing condition, a fixed-color cue appeared briefly at the beginning of each trial. The target matched this color on 50% of trials. In the remaining trials, the target was ±15°, ±30°, ±45° or ±60° away from the cued color (6.25% each) on a color wheel (CIE L*a*b space). In separate blocks of neutral trials, there were no cues. The cueing effect was the difference between the neutral and cued conditions for a given color. Results. For most subjects, we found a significant enhancement for the cued target color and, more importantly, a general trend for inhibition at its immediate neighbors (±15°). Once outside this inhibitory zone, there was a rebound of cueing effect. Thus, our data are consistent with a surround-suppression effect in feature-based attention. We also found evidence for an interaction between attentional modulation and category boundaries in the color space.
Meeting abstract presented at VSS 2017
This PDF is available to Subscribers Only