Exogenous Attention and Inhibition of Return in the Foveola

• DOI: 10.1167/jov.20.11.843
• Publication Date: 2020-10-26T19:33:36Z
• Authors: Yue Zhang; Natalya Shelchkova; Rania Ezzo; Martina Poletti
• Keywords: Stimulus (psychology); Microsaccade

The effects of exogenous attention in the visual periphery have been studied extensively. Yet, it is not well-known if this type can be fine-tuned foveola, 1-degree foveal region where resolution highest. Here, we addressed issue by investigating temporal dynamics inhibition return. This phenomenon typically associated with attention, and involves suppression a stimulus that had recently attended to. A classic spatial cueing paradigm was used. entire array scaled size to fit within foveola. Observers (n=9) fixated on central marker throughout trial. After brief cue, high-acuity stimuli, tiny bars tilted 45 degree, appeared at four locations 11’ away from marker. Following variable inter-stimulus interval, response cue pointing one location. Subjects were instructed determine orientation previously presented there. Trials 50% probability being valid, i.e., when matched. To eliminate confounding factor fixational eye movements, which would otherwise shift fovea, used retinal stabilization; stimuli remained immobile retina, only trials without microsaccades selected for analysis. Our findings show shorter intervals (~60 ms), subjects’ ability discriminate fine details enhanced location reduced unattended (d’ difference between valid invalid trials; 0.49, p<0.01). We also report modulation resembling return, characterized higher performance longer -0.61, These results indicate involuntary scale, contributing enhancement vision.