Access to global and local properties in visual search for compound stimuli

Article Abstract:

Comprehension of the global structure in a traditional compound visual stimuli needs an attention-demanding grouping operation in addition to that required for the comprehension of the local elements. A theory is required which makes distinct forecasts regarding the efficacy with which spatially separated elements can be grouped. Interactions among the receptive fields of cortical neurons can produce some groupings. Visual search studies using occluded shapes and textures have suggested that early visual methods describe a display into areas matching to discrete surfaces in the scene.

Visual perception, Stimulus compounding

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Guided visual search is a left-hemisphere process in split-brain patients

Article Abstract:

Split-brain patients were studied and it was found that higher cognitive techniques such as language and strategic visuospatial attentional process are preferentially lateralized to the left cerebral hemisphere in their case. The capacity to perform guided search is not shown in the right hemisphere even if the search time in that hemisphere is superior to search time in the left. In normal subjects, on the other hand, guided searches are mediated by the callosum in the right hemisphere.

Analysis, Cognition

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Right-hemisphere memory superiority: studies of a split-brain patient

Article Abstract:

The functions of the left and right brain hemispheres in memory for presented material are tested with the possibility of a hemispheric difference that accounts for unpresented material. The hypothetical difference is tested in N400 studies involving split-brain patients. The right hemisphere accounted for more exact memory recollections than the left hemisphere. The difference indicated a more veridical right-hemisphere memory system with a vital adaptive function.

Physiological aspects, Brain, Memory, Localization (Brain function), Cerebral hemispheres

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