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Different inhibitory effects by dopaminergic modulation and global suppression of activity

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3 Author(s)
Hayashi, T. ; Dept. of Appl. Phys., Tokyo Univ. of Sci., Japan ; Araki, O. ; Ikeguchi, T.

In the dopaminergic network system of prefrontal cortex (PFC)-ventral tegmental area (VTA), physiological experiments have been reported that the D2 neurons inhibit the spontaneous activity of PFC neurons. However, the functional role of D2 suppression is not understood well. Is the effect of modulatory D2 inhibition different from that of GABAergic inhibition? The aim of this research is to reveal the difference between modulatory suppression of D2 and global inhibition by interneurons. To compare the effects, we construct two alternative models: (1) all GABAergic interneurons of PFC are modulated by a D2 system, or (2) a global interneuron depolarizes; all of PFC pyramidal cells. In computer simulations, we exemplify each of the models using a spiking neural network model with sparse and random synaptic connections. The simulation result shows that model-(1) keeps high correlation between spatial patterns of mean firing rates and the network structure despite the suppression of activity, while model-(2) reduces the correlation. This result suggests that modulatory suppression of D2 is more than a global suppression and may play a role in memory retrieval function.

Published in:

Neural Networks, 2003. Proceedings of the International Joint Conference on  (Volume:4 )

Date of Conference:

20-24 July 2003