Reaction time asymmetries between expansion and contraction
Different asymmetries between expansion and contraction (radial motions)
 have been reported in the literature. Often these patterns have been regarded
 as implying different channels for each type of radial direction (outward
 versus inwards) operating at a higher level of v...
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| Format: | Article |
| Language: | English |
| Published: |
DIGITAL.CSIC
2005-01-01
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| Series: | Psicológica |
| Online Access: | http://www.redalyc.org/articulo.oa?id=16926110 |
| Summary: | Different asymmetries between expansion and contraction (radial motions)
 have been reported in the literature. Often these patterns have been regarded
 as implying different channels for each type of radial direction (outward
 versus inwards) operating at a higher level of visual motion processing. In
 two experiments (detection and discrimination tasks) we report reaction time
 asymmetries between expansion and contraction. Power functions were fitted
 to the data. While an exponent of 0.5 accounted for the expansion data
 better, a value of unity yielded the best fit for the contraction data. Instead of
 interpreting these differences as corresponding to different higher order
 motion detectors, we regard these findings as reflecting the fact that
 expansion and contraction tap two distinct psychophysical input channels
 underlying the processing of fast and slow velocities respectively. |
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| ISSN: | 1576-8597 |