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Division of Visual Information Processing

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Analysis of mechanisms underlying information processing and experience-dependent functional developments in neocortex

To elucidate the mechanisms underlying information processing in sensory cortex and the experience-dependent regulation of that processing, we are studying the relationship between visual functions and the signaling properties of neural circuits using rat and mouse visual cortex. We are also examining the development of neural circuits and functions based on neural activity or synaptic target recognition using specific molecules. To this end, we are analyzing the visual responses of cortical neurons using multi-channel electrodes or calcium imaging with 2-photon microscopy, neural circuit properties with a combination of laser scanning photostimulation and whole-cell recording methods in slice preparations, and neural connections morphologically using modern virus tracers. The following is a list of our main projects currently ongoing, including collaborative projects with researchers belonging to research organizations other than our institute.

1. The mechanisms that establish fine-scale networks in visual cortex and the role of these networks in visual information processing
2. Cell-lineage dependent establishment of neural connections and visual responsiveness
3. Synaptic plasticity and visual response plasticity in animals at different developmental stages and in animals subjected to the manipulation of visual inputs during postnatal development
4. Morphological analysis of neural circuits using trans-synaptic virus tracers
5. Neural activities in visual and motor cortex underlying visual cue-triggered behavioral

Electriphysiological and morphological analyses of cortical neural circuits

A. Cross-correlation analysis of photostimulation-evoked excitatory postsynaptic currents (EPSCs) simultaneously recorded from a pair of layer 2/3 pyramidal neurons that were synaptically connected.
B. Visualization of neural circuits using a trans-synaptic virus tracer. Presynaptic neurons (green) providing synaptic inputs to some layer 2 pyramidal neurons (yellow) in neocortex.

yoshimura-1

Typical paper information

*Ishikawa, A.W., Komatsu, Y., Yoshimura, Y. (2014) Experience-dependent emergence of fine-scale networks in visual cortex. J Neurosci. 34:12576-86
*Tarusawa E. et al., (2016) Establishment of high reciprocal connectivity between clonal cortical neurons is regulated by the Dnmt3b DNA methyltransferase and clustered protocadherins. BMC Biol. 14(1):103
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