Avtor/Urednik		Kavcic, V; Fei, R; Hu, S; Doty, RW
Naslov		Hemispheric interaction, metacontrol, and mnemonic processing in split-brain macaques
Tip		članek
Vir		Behav Brain Res
Vol. in št.		Letnik 111, št. 1-2
Leto izdaje		2000
Obseg		str. 71-82
Jezik		eng
Abstrakt		These experiments explored the interactions remaining between the cerebral hemispheres in two split-brain macaques. The 'split' was earlier confirmed by showing that one hemisphere was incapable of identifying visual images seen by the other. The critical tests for residual interactions were intermingled with control trials in a continuous recognition task. These tests were of two kinds: 'parallel processing', to determine how simultaneous viewing by both hemispheres affected subsequent recognition by one of them alone; and 'conflict', where opposite responses were demanded from the two hemispheres, thus assessing the issue of metacontrol. Two types of stimuli were also employed: ART, in which each hemisphere saw essentially the same image; and BIPARTITE, in which images were entirely different for each hemisphere. Since, with either type of stimulus, performance was best when viewed by both hemispheres at both encoding and retrieval, 'parallel processing' was highly efficient. However, when both hemispheres viewed initially and only one was subsequently queried, performance was significantly worse than when each hemisphere acted alone on each occasion. It is thus reasoned that when both hemisphere view together, the resultant memory trace somehow reflects the bilaterality, a conclusion concordant with observations of Marcel on blindsight. Processing different images (BIPARTITE) was somewhat more disruptive in this regard than if the same image was viewed by each hemisphere. This was particularly true in the conflict situation, where for one hemisphere the item seen was NEW and for the other it was OLD. A response of 'OLD' was, at first, consistently rewarded. When this well-established protocol was changed, the hemispheres in each animal were gradually able to revise their joint behavior. (Abstract truncated at 2000 characters)
Deskriptorji		ANIMALS ATTENTION BRAIN MAPPING CEREBRAL CORTEX CORPUS CALLOSUM DISCRIMINATION LEARNING DOMINANCE, CEREBRAL MACACA NEMESTRINA PATTERN RECOGNITION, VISUAL