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Biomedical subjects

R R Zimmermann

Publications and source records attributed to R R Zimmermann.

At least 19 recordsLinked to original sources
PubMed1978

Performance of institutional retardates on standard and new forms of the Quick Test.

121 institutionalized mentally retarded patients were tested on Forms 1-3 and 4-6 of the Quick Test; IQs were correlated with other IQs available from institution records. The forms of the Quick Test correlated significantly with the more traditional and time-consuming tests of intellectual performance. It was concluded that the Quick Test is an excellent tool for experimenters and educators who need an efficient and reliable estimate of intellectual development.

Adolescent↗
PubMed1978

Apparent size contrasts of retinal images and size constancy as determinants of the moon illusion.

Kaufman and Rock (1962) and Rock and Kaufman (1962) concluded that the moon illusion is a function of and attributable to apparent distance. They also reported a large framing effect as an exception. Analysis of the effect suggests two components which can account for the illusion independently of apparent distance. These are apparent size contrasts of visual images of discriminable features or objects of the earth with the moon's image and size constancy of the features or objects plus the interactions of the two. Apparent distances to horizons are always a consequence of the necessary conditions for the illusion. They are related to the illusion but are not a determinant of it.

Association↗
PubMed1977

Brunswik ratios: a ratio scale for comparative analyses of size constancy data from different experiments.

The literature on visual size constancy implicitly assumes that the perceived size of any dimension of a thing is evidence of how well (a) any other dimension of the thing will be perceived and (b) any visible dimension of any other thing will be perceived under comparable conditions of perception. For tests of these assumptions Brunswik ratios (1956) are described as a common conceptual and numerical basis, a ratio scale, for testing statistically for differences among or the equivalence of two or more sets of data from different experiments on visual size constancy.

Attention↗