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Biomedical subjects

D Friedrich

Publications and source records attributed to D Friedrich.

At least 37 records · Page 2Linked to original sources
PubMed1979

Visual-motor test performance: race and achievement variables.

Tested rural Michigan black (N = 60) and white (N = 60) children of variant academic achievement on the Minnesota Percepto-Diagnostic Test for visual-motor skill development. The test, which consists of six gestalt designs for the person to copy, includes four measures of such skill development: Degree of copied design rotation and errors of separation of circle-diamond, distortion of circle-diamond and distortion of dots. In general, analyses that statistically controlled for intellectual level indicated that race was not a significant variable in the relationship of achievement level and visual-motor test performance. That is, such analyses resulted only in a significant achievement effect; low achievers, in comparison with high achievers, performed poorly on the copying test. Only with distortion of circle-diamond errors was a race interactive effect noted; i.e., black low achievers had significantly more errors than black high achievers, white low achievers or white high achievers. Results were discussed in relation to environmental determinants and symptomatology correlates.

Achievement↗
PubMed1977

Read-out times from iconic memory in normal and retarded adolescents.

The method limits was used to obtain an estimate of read-out times for a sample of 12 normal and 12 retarded subjects matched on chronological age. The procedure required tachistoscopic presentation of a stimulus array (2, 4, or 6 digits) for a variable duration, followed by a post-stimulus. The subject's task was to recall the digit indicated by the cue. The results indicated that read-out time (a) increased as the number of digits increased, (b) was longer for retardates relative to normals, and (c) decreased with practice for both intelligence groups. The implications of a read-out deficit in retarded individuals were discussed.

Adolescent↗
PubMed1976

Differential diagnosis of psychiatric patients with the Minnesota Percepto-Diagnostic Test.

This study investigated whether normals, personality disorders, psychotics and organics could be differentiated by the Minnesota Percepto-Diagnostic Test. There were significant differences between all the groups except the psychotics and personality disorders. It appears that, in general, perceptual disturbance lies along a pathological continuum. Similar performances of psychotics and personality disorders were discussed.

Diagnosis, Differential↗
PubMed1975

Response-stimulus interval performance of moderately retarded institutionalized subjects.

Based on previous dual reaction-time research with nonretarded and mildly retarded subjects, the expectancy- and capacity-limit hypotheses for the psychological refractory period effect were tested with moderately retarded subjects. The design included regular-irregular procedure, response-stimulus interval, signal, and hand-preference variable levels. The finding of a psychological refractory period effect at the 250-msec response-stimulus interval was consistent with past related research. The moderately retarded subjects indicated a capacity limitation, resulting in the psychological refractory period effect at the rapid response-stimulus interval. Previous researchers working with nonretarded and mildly retarded subjects have suggested an expectancy explanation for the psychological refractory period. This inconsistency in study findings was interpreted on the basis of an organismic confound. Methodological issues were also presented.

Acoustic Stimulation↗