Biomedical subjects
Publications and source records attributed to W L Brigner.
Rapid, apparent, to-and-fro (right-left) rotation of the Necker cube sharply reduced reversals in depth for 10 undergraduates. This finding was considered consistent with the satiation theory of Necker cube reversals.
Rapid, successive presentations of an eccentric circle pattern and its mirror-image elicited apparent depth and, as has been previously demonstrated for the Benussi effect, there was an increase in apparent depth with an increase in circle eccentricity. Taken together, these data were interpreted as contravening Wallach, Adams, and Weisz's account of the Benussi effect as an instance of the kinetic depth effect.
Since apparent brightness increases as an intermittent luminous source decreases from flicker fusion to approximately 10 cps, the phenomenal blackness induced by an intermittent annulus should also increase as a result of brightness contrast. However, data from 5 observers showed the phenomenal blackness occurring with a 10-cps inducer was greater than that expected on the basis of brightness contrast.
Two eponyms, the Purkinje phenomenon and the Bezold-Brücke phenomenon, are sometimes confused in discussions of the effect of light intensity upon perceived color. The former refers to a change in apparent brightness; the latter refers to a change in perceived hue.
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Two tones, differing only in duration, were used to define an interval. The perceived midpoint of the interval was displaced towards the tone of longer duration.
Given two taps on the skin at the same position and a third tap some distance away, an observer reports the second tap as occurring at a position between the first and third taps. This is the saltation phenomenon, and as presented in this theoretical note, it is a phenomenon which is easily accommodated by a theoretical rotation of space-time axes.
It was demonstrated with 7 observers that the duration of a high frequency tone was perceived to be longer than the duration of a low frequency tone, even though the actual duration of the two tones was equal.
Just as circle-size induces differences in the perceived extent of a line which interconnects the circles of the Baldwin illusion, it is demonstrated that circle-size induces differences in the perceived duration of a time interval which intervenes between circles of different sizes.
An auditory illusion was demonstrated in which there was perceptual shortening of the temporal interval contiguous to a low frequency (large) tone and/or perceptual lengthening of the temporal interval contiguous to a high frequency (small) tone. This auditory analogy to the Baldwin figure was demonstrated after first determining that there was a symmetrical expansion of perceived time during the auditory filled-duration illusion.
Two paradigms for the study of velocity contrast have been employed. Paradigm one has focused on perceived velocity changes across a field. Paradigm two has focused on perceived velocity changes at the juncture of disparate velocities. The current experiments employ both paradigms to look at oppositely directed motion. Using paradigm two, it was determined that, with oppositely directed motion, the effect on perceived velocity could not be attributed to lateral inhibitory interaction--in contrast to earlier reports of lateral interaction when motion was in the same direction. Using paradigm one, it was determined that the effect upon perceived velocity with oppositely directed motion appeared to involve inhibition across entire fields of motion.
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When light intensity demarcating a 1-sec. interval was increased, there was an increase in the perceived duration of the interval. The increase in perceived duration occurred whether the light intensity was physically increased or perceptually increased through brightness enhancement.
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Binocular rivalry and the Margaret Thatcher illusion were used to assess the bias, if any, of perceptual set. The data for 8 students suggest that set is negatively biased.
Using the duration of the spiral aftereffect as an index of motion perception, the presence of high spatial frequencies inhibited perceived motion for 12 observers.