Spatial recognition in cats: effects of parahippocampal lesions.

The role of the posterior parahippocampal area of the brain in spatial types of memory in conditions of one-trial visual perception of the positions of objects was studied by training eight cats to remember the spatial positions of either two different objects covering two of three feeders placed on a test tray (tests for the "object-place" association) or the positions of two of three feeders (tests for place). Each trial used new objects and new positions for the two of three feeders. After training, four cats were subjected to electrolytic lesioning of the posterior parahippocampal area, primarily the parahippocampal cortex, parasubiculum, and presubiculum; the remaining four cats underwent all the surgical procedures except electrocoagulation of nervous tissue; this was the sham-operated control group.

[Spatial recognition in cats: effects of parahippocampal lesions].

To determine the contribution of the posterior parahippocampal region to spatial form of one-trial memory in cats, we trained 8 cats to remember the spatial positions of either two different trial-unique objects overlying two of three feeders in a feeder test tray (object-place trials) or simply two of the three feeders (place trials). Four cats then received electrolytic lesions restricted to the posterior parahippocampal region (experimental group) including mainly parahippocampal cortex, parasubiculum and presubiculum. Four other cats comprised sham-operated control group.

One-trial visual recognition in cats: the role of the rhinal cortex.

Memory for visual recognition in primates is at least partially mediated by the peripheral and entorhinal (i.e., rhinal) areas of the cerebral cortex.

[One-trial visual recognition in cats: the role of the rhinal cortex].

Visual recognition memory in primates is mediated at least in part by the perirhinal and entorhinal (i.e., rhinal) cortices.