Cortical neuronal architecture and connectivity can be analyzed with high-resolution optical imaging after staining the in vitro isolated guinea pig brain preparation by circulating the voltage-sensitive dye RH-795 via the arterial system. To establish this new technique, electrical field potentials evoked in the piriform and entorhinal cortices by lateral olfactory tract stimulation were correlated to the optical signal. The depth analysis of the optical response was performed by evaluating the contribution of the mono- and poly-synaptic components of the signal generated in different layers after applying a pair-pulse stimulation protocol. The tangential propagation of neuronal activity in olfactory cortices was evaluated by gathering several 4.2×4.2 mm images recorded from adjacent cortical areas. The real-time optical imaging technique applied to the isolated guinea pig brain can be successfully utilized to study the integrative properties of cortical neurons ensembles.
|Number of pages||10|
|Journal||Denshi Gijutsu Sogo Kenkyusho Iho/Bulletin of the Electrotechnical Laboratory|
|Publication status||Published - 1999|
ASJC Scopus subject areas
- Condensed Matter Physics
- Electrical and Electronic Engineering