Dynamic grouping and interpolation induced by flickering stimuli.
A novel grouping and interpolation effect induced by flickering stimuli is described: a matrix of flickering elements forms stick-like clusters, then the clusters gradually dissociate back into the discrete elements within a few seconds. On continuous viewing, this flicker-induced grouping and interpolation repeatedly disappeared and reappeared. The perceived strength of this phenomenon peaked when the luminance of the flickering elements was alternately darker and lighter than the background; thus, the reversal of the luminance contrast polarity was responsible for flicker-induced grouping. The temporal dynamics of flicker-induced grouping showed the stochastic nature of perceptual alternation, which depended on the global structure of the stimulus. From these results, it is concluded that flicker-induced grouping reflects multiple stages of visual processing.
Sasaki
Hiroyuki
H
Department of Child Education, Niigata Chuoh Junior College, Japan. sasaki@niigatachuoh-jc.ac.jp
D000221:Adaptation, Ocular; D015350:Contrast Sensitivity; D005425:Flicker Fusion; D006801:Humans; D009903:Optical Illusions; D010470:Perceptual Masking; D010775:Photic Stimulation; D011601:Psychophysics; D012684:Sensory Thresholds; D013997:Time Factors