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Brent Parsons, Richard Ivry; Perceptual Consequences of Delaying the Post-saccadic Target. Journal of Vision 2014;14(10):1228. doi: 10.1167/14.10.1228.
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Studies of saccadic adaptation have predominately focused on manipulations in the spatial dimension. Shifting the location of the saccade target midflight leads to changes in the motor command (e.g. saccade amplitude) and affects subsequent perceptual judgments (e.g. localization). Significant gain reduction has been reported even when the shifted target is presented at post-saccade delays of up to 400ms (Shafer, Noto, & Fuchs 2000). Recent experiments manipulating only the temporal dimension, the delay between saccade landing and target presentation, have shown changes in peak velocity of the saccade (Shadmehr et al. 2010). The current study investigates the perceptual consequences of this delayed sensory input. Subjects were asked to judge the duration of a stimulus presented at different delays after saccade landing. The closer in time to the completion of the eye movement the longer the percieved duration of the target stimulus. Our results seem at odds with a previous explanation of temporal distortions around saccades (Yarrow, Haggard, & Rothwell 2010) and are in line with a more general account of how humans adapt to delayed sensory input following voluntary action (Parsons, Novich, & Eagleman 2013).
Meeting abstract presented at VSS 2014
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