Presynaptic modulation as fast synaptic switching: state-dependent modulation of task performance

Details Presynaptic modulation as fast synaptic switching: state-dependent modulation of task performance Presynaptic modulation as fast synaptic switching: state-dependent modulation of task performance

2004-01-25

arxiv.org/abs/cs/0401020v1

Computer Science

Neural and Evolutionary Computing

6 pages, 13 figures

Scientific paper

Neuromodulatory receptors in presynaptic position have the ability to suppress synaptic transmission for seconds to minutes when fully engaged. This effectively alters the synaptic strength of a connection. Much work on neuromodulation has rested on the assumption that these effects are uniform at every neuron. However, there is considerable evidence to suggest that presynaptic regulation may be in effect synapse-specific. This would define a second "weight modulation" matrix, which reflects presynaptic receptor efficacy at a given site. Here we explore functional consequences of this hypothesis. By analyzing and comparing the weight matrices of networks trained on different aspects of a task, we identify the potential for a low complexity "modulation matrix", which allows to switch between differently trained subtasks while retaining general performance characteristics for the task. This means that a given network can adapt itself to different task demands by regulating its release of neuromodulators. Specifically, we suggest that (a) a network can provide optimized responses for related classification tasks without the need to train entirely separate networks and (b) a network can blend a "memory mode" which aims at reproducing memorized patterns and a "novelty mode" which aims to facilitate classification of new patterns. We relate this work to the known effects of neuromodulators on brain-state dependent processing.

Affiliated with

Also associated with

No associations

Rating

Presynaptic modulation as fast synaptic switching: state-dependent modulation of task performance does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Presynaptic modulation as fast synaptic switching: state-dependent modulation of task performance, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Presynaptic modulation as fast synaptic switching: state-dependent modulation of task performance will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-420110