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Animal cognition: monkey looks contradict hume.
Juan-Carlos Gómez
Current biology : CB. 16 (14), R538-9 (25 Jul 2006)
Posted by iandol to cognition Perception on Thu Jul 27 2006 at 11:09 UTC | info | related
 
Learning and decision making in monkeys during a rock–paper–scissors game
Daeyeol Lee, Benjamin P McGreevy, and Dominic J Barraclough
Brain research. Cognitive brain research. 25 (2), 416-30 (Oct 2005)
 
Neural impact of the semantic content of visual mental images and visual percepts.
A Mazard et al.
Brain Res Cogn Brain Res 24 (3), 423-35 (Aug 2005)
The existence of hemispheric lateralization of visual mental imagery remains controversial. In light of the literature, we used fMRI to test whether processing of mental images of object drawings preferentially engages the left hemisphere to compared non-object drawings. An equivalent comparison was also made while participants actually perceived object and non-object drawings. Although these two conditions engaged both hemispheres, activation was significantly stronger in the left occipito-temporo-frontal network during mental inspection of object than of non-object drawings. This network was also activated when perception of object drawings was compared to that of non-object drawings. An interaction was nonetheless observed: this effect was stronger during imagery than during perception in the left inferior frontal and the left inferior temporal gyrus. Although the tasks subjects performed did not explicitly require semantic analysis, activation of this network probably reflected, at least in part, a semantic and possibly a verbal retrieval component when object drawings were processed. Mental imagery tasks elicited activation of early visual cortex at a lower level than perception tasks. In the context of the imagery debate, these findings indicate that, as previously suggested, figurative imagery could involve primary visual cortex and adjacent areas.

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