The redistribution of neuronal activity across rat barrel cortex following an alteration in whisker usage has been investigated. In adult rats, two mystacial vibrissae - D2 and one neighbor, D1 or D3 were left intact while all other vibrissae on that side of the snout were clipped. Neurons in contralateral barrel cortex were sampled with a microelectrode array 3.5 days later. Stimulation of clipped vibrissae produced a narrow spatial distribution of cortical activity, whereas stimulation of intact vibrissae produced a widened spatial distribution. Simultaneous recordings from multiple cortical barrel-columns suggest that changes in the effective connectivity between barrel-columns may partially account for this redistribution of sensory responses. Evidence is also presented for a second mechanism, a release from inhibition in sensory-deprived cortical areas. A model is therefore proposed where these two mechanisms operate together to regulate the cortical distribution of evoked activity.
|Titolo:||Experience-dependent plasticity of rat barrel cortex: Redistribution of activity across barrel-columns|
|Autori:||Lebedev, Mikhail A.; Mirabella, Giovanni; Erchova, Irina; Diamond, Mathew E.|
|Data di pubblicazione:||2000|
|Digital Object Identifier (DOI):||10.1093/cercor/10.1.23|
|Appare nelle tipologie:||1.1 Journal article|