Long-range horizontal connections and their role in cortical reorganization revealed by optical recording of cat primary visual cortex
Article Abstract:
A study of the optical and spike point spread (PS) region of the primary visual cortex shows that 95% of the area of activation is formed by subthreshold activation which is controlled by the long-range horizontal connections radiating from the spike locus. Optical recordings of the cortex of cats which have undergone focal binocular retinal lesions show that after topographic cortical reorganization, the spike PS enlarges to cover the entire PS area seen in normal cats and the subthreshold activation reaches suprathreshold levels while the overall orientation map stays the same. This evidence suggests that the intrinsic horizontal connections may cause the remapping after an injury.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
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Topography of contextual modulations mediated by short-range interactions in primary visual cortex
Article Abstract:
The strength of local cortical interactions is a graded function of cortical distance with a spatial scale matching the periodicity of cortical maps and separate from relative orientation. Research into the different responses of neurons in primary visual cortex (V1) to a simple visual element presented in isolation from when it is integrated in a complex range also highlights a new set of response properties in V1 produced by local cortical interactions. These properties are a set of graded specializations for processing locally complex visual features.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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Distortions of visuotopic map match orientation singularities in primary visual cortex
Article Abstract:
The relation between maps of space and orientation in cat V1 can be investigated by using a combination of optical imaging of intrinsic signals and extracellular recording of receptive fields. It was established that the map of visual space on cat V1 has marked and systematic local distortions in register with inhomogeneities in the orientation map. This finding indicates that there may be systematic local variations in the functional connectivity of short-range lateral connections which form the basis of cortical processing.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997
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