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Biomedical subjects

P Satz

Publications and source records attributed to P Satz.

At least 145 records · Page 8Linked to original sources
PubMed1978

Simultaneous performance on verbal, nonverbal and motor tasks by right-handed adults.

A series of four dual task experiments was conducted in which different groups of right-handed Ss (N1 = 24; N2 = N3 = N4 = 18) simultaneously performed a repetitive finger tapping task in conjunction with: (a) a verbal fluency task (Experiment I); (b) listening to logical memory stories from the Weschler Memory Scale (Experiment II); (c) reading logical memory stories (Experiment III); and (d) scanning an array of faces (Experiment IV). Results indicated that all three verbal tasks produced significant asymmetrical depression in tapping performance, with the right hand being more disrupted then the left. The visuo-spatial task, however, exerted symmetrical bilateral depression of both hands. Performance on the cognitive tasks (number of words produced in the verbal fluency task; recall of stories either listened to or read, recognition of faces) was unaffected by simultaneous digital tapping.

Adult↗
PubMed1978

Hemispheric asymmetries of affective processing as determined by the Minnesota Multiphasic Personality Inventory.

Patients with left hemisphere disease have been noted to be depressed while those with right hemisphere disease appear indifferent. While patients with left hemisphere disease frequently have a greater cognitive deficit, patients with right hemisphere disease have difficulty in expressing affectively intoned speech. The Minnesota Multiphasic Personality Inventory (MMPI) can demonstrate underlying affective experience and is not dependent on affectively intoned speech. The purpose of this study was to determine whether a difference in affective moods, as assessed by the MMPI, was related to laterality of lesion in patients matched for severity of cognitive and motor dysfunction. Seven of the 16 subjects with left hemisphere dysfunction and none of the eight subjects with right hemisphere dysfunction showed an elevation on the depression scale. This observation not only confirms previous clinical observations but also demonstrates that these asymmetries cannot be ascribed completely to hemisphere-related differences in cognitive deficits or expressive abilities.

Adult↗
PubMed1977

WAIS performance in brain-damaged left- and right-handers.

WAIS performance was compared in 35 pairs of left- and right-handed subjects who had been individually matched for lateralization, cause of brain damage, age, education, and gender. WAIS results were similar in the two groups as well as in two subgroups of subjects with unilateral brain damage. No differences between the unilateral groups were found to support the hypothesis advanced by Levy and Nagylaki in 1972 that left-handers have inferior visual-spatial abilities.

Adult↗
PubMed1977

Laterality tests: an inferential problem.

A Baysean analysis is used to examine some of the inductive inferences about hemispheric "dominance" based on various laterality measures (e.g., dichotic listening). The results reveal some glaring errors of induction that may occur when inferences are made on constructs that have a low probability of occurrence in the population (i.e., right brain speech). The problem of measurement error and test validity is also discussed.

Adult↗
PubMed1977

Within-modal and cross-modal reliabilities of two laterality tests among left handers.

20 left handers were administered four repeat testing of a dichotic listening task and a verbal visual half-field task. Scores on the dichotic task were reliable between Days 1 and 4 while visual half-field performance did not stabilize until two testing sessions. Left handers showed a clear right channel, superiority of the right visual half field for the verbal material. No significant cross-model reliabilities were observed. It was also found that, in comparison to right handers, left handers show more variability in channel/visual half field than right handers on the same procedures.

Auditory Perception↗
PubMed1976

Visual pathways, acuity dominance, and visual half-field asymmetry.

The effects of the visual pathways and acuity dominance on visual half-field (VHF) recall of verbal stimuli were investigated with 36 right-handed male undergraduates, with the use of the Hines-Satz short-term memory paradigm under monocular conditions. Scores for stimuli transmitted via the left temporal and right nasal pathways were significantly greater than those for stimuli transmitted via the left nasal and right temporal pathways. No other significant differences were found for either the pathways or acuity dominance variables. The results were hypothesized to reflect the primary influence of hemispheric asymmetry of function on the VHF recall task.

Adolescent↗
PubMed1976

Neuropsychologic, intellectual, and personality correlates of chronic marijuana use in native Costa Ricans.

The present cross-cultural study investigated the effects of chronic marijuana usage on higher adaptive brain functions and personality in native Costa Ricans. After extensive standardization in Costa Rica, a battery of neuropsychologic, intelligence, and personality tests was administered to two carefully matched groups of marijuana users and controls (NU = NC = 41). Multivariate analyses of multiple combinations of variables, followed by separate univariate tests on each measure, revealed essentially no significant differences between users and nonusers on any of the neuropsychologic, intelligence, or personality tests. Furthermore, no relationship was found between level of daily use (high vs low) and test performance. These findings were discussed in terms of previous chronic and acute studies of changes in adaptive brain functions and personality as a function of marijuana intake.

Adolescent↗