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Cytoarchitecture of the canine perirhinal and postrhinal cortex

100%

Woznicka A., Kosmal A.

Acta Neurobiologiae Experimentalis

2003

vol. 63

issue 3

197-209

The perirhinal cortex in the dog?s brain is composed of two traditional Brodmann?s areas: 35 and 36. Area 35 is situated along the entire rostro-caudal extent of the fundus of the posterior rhinal sulcus, whereas area 36 occupies its lateral bank. In this study, four subdivisions were distinguished in area 35 based on cytoarchitectonic differentiation. Area 36 is poorly developed in the dog?s brain and was divided into two subdivisions. The most characteristic features of area 35 are: a wide layer I, scattered cell clusters in layer II, and a prominent layer V containing a distinct population of large multiform neurons. Area 36 can be recognized by the presence of numerous cell clusters in layer II and increasing radial arrangement of neurons in deep layers of the area. Two fields of the postrhinal cortex were identified in the additional postrhinal gyrus, which is found in the fundus of the most caudal extent of the posterior rhinal sulcus.

Involvement of single unit activity in inferotemporal and perirhinal cortices in recognition memory of visual objects in the macaque

86%

Sobotka S.

Acta Neurobiologiae Experimentalis

2000

vol. 60

issue 2

219-226

Recognizing objects from the past is a vitally important ability for everyday live. The studies of brain mechanisms responsible for visual recognition memory suggest that the modulation of single unit activity in the inferotemporal and perirhinal cortices could be an important part of the neuronal substrate of recognition memory. In this review, I will describe Stimulus Specific Adaptation (SSA) - the reduction in neuronal response to previously viewed objects. The experimental tasks in which SSA is observed will be presented, along with the possibility that SSA may be enhanced by saccadic exploration of visual scene. Next, I will demonstrate that under special circumstances (partially split-brain preparation) monkeys could recognize the re-presentation of visual images without the concomitant appearance of SSA. The most promising alternative candidate for neuronal mechanism involved in recognition memory is delay activity - an increased frequency of cell firing in the time between the initial presentation of an image and its subsequent re-presentation. In order to determine if delay activity is important for recognition we have started to investigate the effects on recognition memory of disrupting delay activity by electrical stimulation. Preliminary results indicate a positive correlation between a reduction in delay activity and a decrease in recognition performance.

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2 Acta Neurobiologiae Experimentalis

1 2003

1 2000

1 Kosmal A.

1 Sobotka S.

1 Woznicka A.

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Cytoarchitecture of the canine perirhinal and postrhinal cortex

Involvement of single unit activity in inferotemporal and perirhinal cortices in recognition memory of visual objects in the macaque