Emergence of feature-specific connectivity in cortical microcircuits in the absence of visual experience

Ko, Ho and Mrsic-Flogel, Thomas D. and Hofer, Sonja B.. (2014) Emergence of feature-specific connectivity in cortical microcircuits in the absence of visual experience. Journal of Neuroscience, 34 (29). pp. 9812-9816.

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Official URL: http://edoc.unibas.ch/dok/A6289068

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In primary visual cortex (V1), connectivity between layer 2/3 (L2/3) excitatory neurons undergoes extensive reorganization after the onset of visual experience whereby neurons with similar feature selectivity form functional microcircuits (Ko et al., 2011, 2013). It remains unknown whether visual experience is required for the developmental refinement of intracortical circuitry or whether this maturation is guided intrinsically. Here, we correlated the connectivity between V1 L2/3 neurons assayed by simultaneous whole-cell recordings in vitro to their response properties measured by two-photon calcium imaging in vivo in dark-reared mice. We found that neurons with similar responses to oriented gratings or natural movies became preferentially connected in the absence of visual experience. However, the relationship between connectivity and similarity of visual responses to natural movies was not as strong in dark-reared as in normally reared mice. Moreover, dark rearing prevented the normally occurring loss of connections between visually nonresponsive neurons after eye opening (Ko et al., 2013). Therefore, our data suggest that the absence of visual input does not prevent the emergence of functionally specific recurrent connectivity in cortical circuits; however, visual experience is required for complete microcircuit maturation.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Former Organization Units Biozentrum > Neuronal circuits and brain function (Hofer)
UniBasel Contributors:Mrsic-Flogel, Thomas and Hofer, Sonja
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Society for Neuroscience
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:27 Nov 2017 13:27
Deposited On:10 Oct 2014 09:19

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