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Michael Slugocki, Catherine Duong, Allison Sekuler, Patrick Bennett; Evaluating Temporal Interactions Between Pairs of Shapes . Journal of Vision 2016;16(12):796. doi: 10.1167/16.12.796.
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© ARVO (1962-2015); The Authors (2016-present)
Previous work evaluating temporal interactions between shapes defined by radial frequency (RF) contours has demonstrated that thresholds for detecting curvature along a target shape increase in the presence of a forward or backward mask, though backward masks presented at stimulus onset asynchronies (SOAs) between 80-100ms result in the most dramatic elevation in thresholds (Habak et al., 2006). If a pair of masks is used, where the first mask is presented concurrently with the target, and the second mask is presented at the peak backward SOA, the two shapes exert the same magnitude of masking as is observed when a single mask appears at the same SOA onset as the first mask shown in sequence (Habak et al., 2006). The current study aimed to extend these previous finding by examining how the effect of masking changes when the second mask is presented at both positive and negative SOAs, as forward masking using pairs of masks has yet to be explored. We measured detection thresholds for an RF5 contour in the presence of a surrounding RF5 mask presented at the same time as the target, along with a second RF5 mask presented at one of five different SOAs (-100ms, -50ms, 0ms, +50ms, +100ms). Consistent with previous findings, the strength of the pair of masks remains approximately the same between the zero and +100ms SOA condition. However, two out of the three observers show a significant increase in the effect of masking when the second mask is presented at negative SOAs, where the effect of masking is strongest at a -100ms SOA. Overall, these results suggest that there exist important differences in the dynamic interactions that occur between isolated versus pairs of shapes across time.
Meeting abstract presented at VSS 2016
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