Abstract
Continually observing an ambiguous figure, we can perceive reversals between different interpretations. How perceptual reversals change when an ambiguous stimulus is presented intermittently? Since no reversal can be consciously perceived during off-periods, we use net Average Reversal Interval (netARI) but not usual average reversal interval to measure the perceptual reversal rate. NetARI is calculated by dividing accumulated time of on-periods by the number of reversals. The results are: (1) presenting an ambiguous figure intermittently increased the perceptual reversal rate; (2) the longer the exposure of Necker cube, the slower the perceptual reversal rate was, and when on-periods were longer as 15 s, the perceptual reversal rate was slowed down and was almost same to that in the continuous case; (3) the length of off-periods (which ranged from 1 s to 5 s in the present study) did not affect the reversal rate.
Highlights
Ambiguous figures are known for their defining feature that viewers can alternately perceive two or more visual configurations during continuous observation.According to previous studies, the perceptual reversal rate is influenced by various factors, including figure size (Washburn et al 1931; Goldhamer 1934; Spitz and Lipman 1962), luminance (Mull et al 1954, 1956; Heath et al 1963), room temperature (Heath et al 1963), and whether the two configurations are perceived or not (Moreno-Bote et al 2010).Besides visual factors, observation time (Brown 1955) and intermittent presentation (Orbach et al 1963a; Magnussen 1972) influence the perceptual reversal rate
From the figure we know that the net Average Reversal Interval (netARI) in the continuous presentation were longer than that in the intermittent presentation
Because the mean of netARI differences is 1.14 for all subjects, we know that netARIs in intermittent conditions are shorter than that in continuous conditions
Summary
Ambiguous figures are known for their defining feature that viewers can alternately perceive two or more visual configurations during continuous observation. Observation time (Brown 1955) and intermittent presentation (Orbach et al 1963a; Magnussen 1972) influence the perceptual reversal rate. While viewing the figure the processes mediating the perception of one orientation become satiated, and when this satiation threshold is reached a reversal is perceived To verify their theory, they presented the Necker cube tachistoscopically using two different frequencies, and recorded the reversal rate. Measure how frequently perceptual reversals occur in intermittent conditions The Average Reversal Interval (ARI), defined as time interval between reversals in the perception of an ambiguous stimulus, is typically used to evaluate how fast perceptual reversals occur, and calculated by dividing trail duration by the number of reversals. When a stimulus is presented intermittently, it is questionable to use whole trial duration to calculate the ARI since there are exactly no reversals could be consciously perceived during off-periods.
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