Crisis communications: making the best of a bad situation.
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California↗
Biomedical subjects
P J MacCracken
Publications and source records attributed to P J MacCracken.
Effects of posthypnotic suggestion on perceived egocentric distance.
The effects of posthypnotic suggestion on the perception of egocentric distance were evaluated by two methods, one direct and the other indirect. The direct method was the verbal report of the perceived distance of the stimulus. The indirect method used a measure based on apparent concomitant motion of the stimulus with a lateral movement of the head. The indirect method, unlike the direct method, has been shown to be insensitive to cognitive biases. Two highly trained hypnotic observers received posthypnotic suggestions to see a point of light at approximately 2, 4, or 6 ft (61, 122, or 183 cm) from themselves. For each suggested distance the light was physically at 2, 4, or 6 ft. As a control, trails were completed using these same physical distances without the posthypnotic suggestions. Nine experimental trails, one for each combination of suggested distance and physical distance, constituted a trial set. One observer completed three sets, and the other completed two sets. It was found that the posthypnotic suggestions affected the direct but not the indirect measures of the perceived distances of the light.
Adolescent↗
Depth adjacency and induced motion.
Induced motion was investigated as a function of the stereoscopic separation of the test and inducing object and the instructions to attend to or to ignore the inducing object. It was found that stereoscopically displacing the test object from the inducing object with both kinds of instructions resulted in a decrease in the magnitude of induction particularly with crossed disparity. These results are consistent with the adjacency principle and with the ability of attention as well as adjacency to modify the magnitude of the induced motion.
Attention↗
Experience and latency to achieve stereopsis: a replication.
This study replicated and extended the findings of MacCracken and Hayes (1976). 10 students were presented the same complex stereogram for 5 trials daily over 2 nonconsecutive days, and latencies to achieve depth perception were recorded. Latencies decreased across 5 trials in the first session but were somewhat longer at the beginning of the second session than at the end of the first session.
Adolescent↗
Experience and latency to achieve stereopsis.
This study assessed perceptual learning effects with complex random-dot stereograms. Observers were shown the same complex anaglyph five times daily, for four consecutive days, and latencies to achieve stereopsis were recorded. Two-factor repeated-measures analysis of variance yielded significant effects of days, trials, and days-by-trials interaction. Latency to achieve stereopsis decreases over trials each day, but this decrease is not completely transferred across days. It is concluded that obervers must, in some sense, "re-learn" how to perceive complex stereograms if subsequent presentations occur over more than one day.
Adult↗
Marketing communications: good medicine for health care.
With falling market shares, increased competition, and the need to position themselves in an ever-changing field, health-care professionals are using marketing communications with increasing frequency to reach their target audience.
Communication↗