Abstract
Previous work indicates that extrapolation of object motion during occlusion is affected by the velocity of the immediately preceding trial. Here we ask whether longer-term velocity representations can also influence motion extrapolation. Red, blue or green targets disappeared behind an occluder. Participants pressed a button when they thought the target had reached the other side. Red targets were slower (10–20 deg/s), blue targets moved at medium velocities (14–26 deg/s) and green targets were faster (20–30 deg/s). We compared responses on a subset of red and green trials which always travelled at 20 deg/s. Although trial velocities were identical, participants responded as if the green targets moved faster (M = 22.64 deg/s) then the red targets (M = 19.72 deg/s). This indicates that motion extrapolation is affected by longer-term information about the typical velocity of different categories of stimuli.
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Notes
12 additional participants were tested (8 females, age 22–28) with the colour–velocity relationship reversed, so red targets were faster and green targets were slower. Probe trial error from both experiments was analysed with a mixed ANOVA [(distribution (fast, slow) × colour (green, red)]. There was a main effect of distribution (F(1,22) = 4.882, P = 0.038), which did not interact with colour (F(1,22) < 1, NS), indicating that response times were significantly earlier for the faster distribution, irrespective of the colours used.
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This research was supported by a British Academy small grant SG-39190 awarded to the second and third authors and an ESRC studentship awarded to the first author.
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Makin, A.D.J., Stewart, A.J. & Poliakoff, E. Typical object velocity influences motion extrapolation. Exp Brain Res 193, 137–142 (2009). https://doi.org/10.1007/s00221-008-1678-0
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DOI: https://doi.org/10.1007/s00221-008-1678-0