Temporal and spatial frequency tuning of the flicker motion aftereffect

• Published in: Vision research (Oxford) 1996-09, Vol.36 (17), p.2721-2727
• Main Authors: Bex, Peter J., Verstraten, Frans A.J., Mareschal, Isabelle
• Format: Article
• Language: English
• Subjects: Adaptation; Adaptation, Ocular; Afterimage - physiology; Biological and medical sciences; Fixation, Ocular; Fundamental and applied biological sciences. Psychology; Humans; Motion aftereffects; Motion Perception - physiology; Optical Illusions - physiology; Pattern Recognition, Visual - physiology; Perception; Photic Stimulation; Psychology. Psychoanalysis. Psychiatry; Psychology. Psychophysiology; Psychophysics; Space life sciences; Spatial tuning; Temporal tuning; Time Factors; Vision
• ISSN: 0042-6989; 1878-5646
• DOI: 10.1016/0042-6989(96)00004-1

The motion aftereffect (MAE) was used to study the temporal and spatial frequency selectivity of the visual system at supra-threshold contrasts. Observers adapted to drifting sine-wave gratings of a range of spatial and temporal frequencies. The magnitude of the MAE induced by the adaptation was measured with counterphasing test gratings of a variety of spatial and temporal frequencies. Independently of the spatial or temporal frequency of the adapting grating, the largest MAE was found with slowly counterphasing test gratings (at approximately 0.125–0.25 Hz). The largest MAEs were also found when the test grating was of similar spatial frequency to that of the adapting grating, even at very low spatial frequencies (0.125 c/deg). These data suggest that MAEs are dominated by a single, low-pass temporal frequency mechanism and by a series of band-pass spatial frequency mechanisms. The band-pass spatial frequency tuning even at low spatial frequencies suggests that the “lowest adaptable channel” concept [Cameron et al. (1992). Vision Research, 32, 561–568) may be an artifact of disadvantaged low spatial frequencies using static test patterns.