No description available.

The study of anthropoid primates has enabled investigators to characterize the role of the occipital cortex in the mediation of the major part of primate visual behavior. The additional discovery of "psychic blind-ness" associated with temporal lobe removal opened the way for the subsequent identification of the inferotemporal deficit. More recently, understanding of visual mechanisms has been enriched by the study of more "primitive" species such as the tree shrew. Behavioral studies of the tree shrew have shown that, like the monkey, both the occipital and temporal cortices have a role in basic visual functions. On anatomical grounds, the bush baby is considered to have a visual system intermediate in complexity to that of the tree shrew and that of the monkey. This study was initiated to determine if the visual capacities of the bush baby were Intermediate to those described for the tree shrew and the monkey. / This thesis was digitized as part of a project begun in 2014 to increase the number of Duke psychology theses available online. The digitization project was spearheaded by Ciara Healy.

No description available.

No description available.

No description available.

No description available.

The time course of texture segregation was studied for three different measures of segregation (detection, localization and identification of an embedded texture region) under three different raster width conditions (26$ sp prime$, 43$ sp prime$ and 61$ sp prime$ of arc) by using a backward masking paradigm. The masking data were described with an exponential model the parameters of which represent rate of performance improvement and asymptotic performance level. The results indicate that: (1) information supporting localization accrues more rapidly than information supporting identification, (2) increasing element spacing had a more detrimental effect on identification than on localization, (3) under most spacing conditions, performance on detection fell between that for localization and identification. In conclusion, these three widely used texture segregation tasks cannot be considered equivalent measures of a single process. However, comparisons among their respective time courses may enable us to better characterize the mechanisms underlying the segregation process.

This study sought to compare Viktor Lowenfeld's Haptic Visual theory of perceptual types with Herman Witkin's Field Dependent, FieldIndependent classifications, since previous research indicated apparent similarities. The major objective was to compare the two theories by administering five perceptual tasks to 34 college students who had been classified into perceptual types according to Lowenfeld's and Witkin's criteria. Thirty-four randomly selected, female, elementary education majors from Wright State University were administered a series of five perceptual tasks involving visual, auditory, tactile, and kinesthetic stimuli while an electroencephalograph (EEG) recorded their alpha wave responses eminating from the occipital lobe of the brain. Since alpha waves have consistently been found to be negatively associated with visual imagery, it was hypothesized that Lowenfeld's Haptic types, who theoretically function better through tactile and kinesthetic perception than through visual images, would produce a greater number of alpha waves during the specified time limit of each perceptual task, than the Visual type, who apparently relies upon his sense of vision as the dominant intermediary to his environment. It was further hypothesized that Witkin's Field Dependent types would correspond to the Haptic types, and the Field-Independent types would correspond to the Visual types as measured by the EEG.

Thesis--University of Florida. / Description based on print version record. Typescript. Vita. Includes bibliographical references (leaves 80-82).

Thesis (Ph. D.)--University of Wisconsin--Madison, 1971. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.