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Paper   IPM / Cognitive Sciences / 8975
School of Cognitive Sciences
  Title:   Dynamic shift of visual receptive fields in the motion-detection hierarchy
  Author(s): 
1.  A. Daneshmand
2.  A. Ezzati
  Status:   In Proceedings
  Proceeding: The European Conference on Visual Perception (ECVP)
  Year:  2007
  Supported by:  IPM
  Abstract:
We measured potential effects of first- and second-order motion on the spatial position of receptive fields (RF) in motion-detection hierarchy. After adaptation with first- or second-order motion for 30 s, a dynamic counter-phase grating (first-order adaptor) or a bistable stimulus composed of two identical superimposed sinusoidal gratings with opposite motion direction )secondorder adaptor) was presented as the test stimulus for 30 s. After adaptation, a perceptual bias occurred in detection of motion direction (classical motion aftereffect). Test stimuli were shown randomly in 8 different positions aligned with the adaptor. Subjects' task was to report perceived direction of motion. The fraction of time in which MAE was perceived in the expected direction was used as a measure of MAE strength in each area. We found MAE strength greater in the areas toward the direction of adaptation, both in the area of adaptation ( p < 0.05) and outside it ( p < 5 0.05). This is congruent with the idea that adaptation results in skewness of neuronal RFs toward the direction of motion.

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