Purchase this article with an account.
Cybelle Smith, Kara Federmeier; Processing Stage Affected by Visual Prediction is a Function of Preparation Time. Journal of Vision 2017;17(10):852. doi: 10.1167/17.10.852.
Download citation file:
© ARVO (1962-2015); The Authors (2016-present)
Preparatory preactivation of visual features has been shown to facilitate image processing using behavioral and neurophysiological measures. We explored how the amount of predictive preparation time (i.e., the time between display of a visual scene cue and its recently associated novel object target) would modulate the timing, nature and amount of visual processing facilitation at the target. We recorded EEG as 48 participants learned paired associations between visual scenes and novel objects from novel object categories. At test, participants indicated whether an object matched a previously viewed scene. Critically, at test, the scene was previewed for either 200ms (N=24) or 2500ms (N=24), prior to object onset. ERPs time-locked to object onset at test displayed a graded pattern of facilitation contingent on how closely the test object matched that presented with the scene at study. Critically, the time-course of this sensitivity varied with the amount of preview time, such that fine-grained distinctions based on object similarity and category structure were observed earlier in the long preview condition. With long previews, graded facilitations emerged during the N300 time window, as early as 200-300ms, suggesting that participants were able to anticipate structural features of the objects and object categories. Instead, when participants had little time to develop predictions, fine-grained distinctions emerged only later, beginning at ~300-400ms. In addition, a later positivity (400-600ms) exhibited a similar graded pattern of effects, and may reflect integrative processing used to assess the degree of match between the presented object and the scene. With short previews, this later positivity was numerically larger and exhibited a larger contrast between matching and mismatching objects. Our findings suggest that visual predictive preactivation percolates earlier in the visual processing stream when more time is available to generate a (more detailed) prediction.
Meeting abstract presented at VSS 2017
This PDF is available to Subscribers Only