Biomedical subjects
Publications and source records attributed to N H Kerr.
Most nocturnal dream reports of 4 young-adult subjects were of events reported to have been experienced from an own-eyes perspective. The alternative, see-oneself, perspective seems to be incompatible with full dream elaboration. This may help to explain the primitive form of dreaming in early development, when children are unable to imagine their own active participation in dream events.
A series of five experiments was conducted to test the optimal speed for performing two- and three-dimensional imagery tasks. Subjects were required to keep track of the location of a pathway in an imagined matrix, as the directions of its successive movements were described verbally. Matrices varied in size and in number of spatial dimensions, with two-dimensional matrices drawn on cardboard and three-dimensional ones built from wooden blocks. When subjects were able to dictate the rate of presentation of the terms describing the pathway, they preferred slower rates for three-dimensional than for two-dimensional stimuli. In subsequent experiments, very fast presentation rates had a larger detrimental effect on performance with three-dimensional matrices than with two-dimensional matrices. A comparison of the patterns of performance for subjects who generally scored high with the patterns for those who scored low showed a stronger effect of dimensionality for poor performers, suggesting that individual differences mediate performance on the task.
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Three experiments on memory for unfamiliar voices are reported. In the first two experiments, the type of encoding was manipulated by orienting tasks. In each study, one group rated the pleasantness of the voices, another group made judgments of pitch, and a third group performed no orienting task. Recognition memory was not correlated with encoding condition in either experiment. In Experiment 2, voice memory was better when the message remained constant from study to test than when it was changed. In Experiment 3, a group of blind adults was tested with no orienting task. The blind subjects' memory was equivalent to that of the appropriate sighted group of Experiment 2. It is proposed that voices represent a psychologically unitary stimulus that cannot be encoded with differing degrees of elaboration; therefore, voices are not sensitive to orienting tasks in the way that other classes of events, such as words and faces, are.
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A sentence in discourse may appear in the passive voice to emphasize the logical object rather than the logical subject when it is thematically more important. Two experiments are reported that explore the impact of this textual function of voice on sentence memory. The first experiment required subjects to listen to prose passages and then recall them. Sentences were recalled predominantly in the active voice regardless of voice or thematic focus in the prose passage, showing that the English-language bias for the active voice was a more important determinant of sentence reconstruction than was the experiment manipulation of thematic context. The second experiment required subjects to listen to or read either prose passages or lists of unrelated sentences and then to try to recognize "key" sentences that were either unchanged or changed lexically, semantically, or in voice. Recognition, both overall and specifically for voice, was better for sentences that were read than for those that were heard, and recognition for semantic change was consistently higher than for any other. Only when passages were read was there evidence in support of a thematic textual influence on memory for sentence voice.
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Our paper addresses, as did a recent study by Greenwood et al. (1977), the question of differential right vs. left hemispheric involvement in REM-sleep dreaming. A male subject with extensive lesioning of the right hemisphere and consequent contralateral homonymous hemianopia was studied for 2 nights in a sleep laboratory where a dream report was collected following each of 6 awakenings from REM sleep. The subject's dream reports were typically sequential and narrative in form, but were lacking specifically in continuous visual imagery. The occasional visual images that appeared in the subject's dreams were described as fragmentary and static in nature. The subject also was unable to perform waking tasks requiring the kinematic representation of extrapersonal space. These observations support the hypotheses that dream narratives may derive from different neurocognitive sources than do the specifically visual realizations of those narratives, and that the visual mediation of dream experience may depend on right-hemispheric processing. Differences between our findings and those of Greenwood et al. may be attributable to differences in dream interview technique.