An oblique effect in parafoveal motion perception

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Paper

Link: https://www.sciencedirect.com/science/article/pii/004269899390233M
Year: 1993

Summary

discriminate angular direction of moving grating in different frequency and in parafoveea

Results

• at low spatial frequencies, subjects tended to perceive motion along the expected diagonal axis. As spatial frequency increased, perceived directions began to deviate from the expected oblique axis and toward the vertical or horizontal meridians.
• lowest spatial frequency (7.6), perceived direction of the oblique gratings was nearly veridical (coinciding with reality)
• Observers apparently do not perceive motion in diagonal directions at high spatial frequencies in the parafovea.
• at high spatial frequencies in the parafovea, our observers perceived motion mainly along principal meridians
• Perceived direction deviates widely from the expected axis for oblique gratings but not for vertical or horizontal gratings.
• sensitivity to diagonal motion is selectively impaired at high spatial frequencies