Tuesday, September 06, 2005
Interneuron density series: circuit complexity and axon wiring economy of cortical interneurons
"Brain systems with ‘simple’ computational demands evolved only a few neuron types. The basal ganglia, thalamus and the cerebellum possess a low degree of variability in their neuron types. By contrast, cortical structures have evolved in a manner that most closely resembles a relatively sparsely connected network of few principal cell types and many classes of GABAergic interneurons."
"Three major groups of cortical interneurons are recognized: (i) interneurons controlling principal cell output (by perisomatic inhibition), (ii) interneurons controlling the principal cell input (by dendritic inhibition) and (iii) longrange interneurons coordinating interneuron assemblies."
The interesting implication here is that the computation may be shaped and controlled primarily by the interneurons (inhibitory neurons).
The idea of separately controlling cell input and output with additional neurons inspired LSTM (long short-term memory networks). However, LTSM is a classical "average firing rate" network, not a spiking one.
Another observation is that a small number of long-range connections is required so achieve global synchronization by reducing the network diameter
"Brain systems with ‘simple’ computational demands evolved only a few neuron types. The basal ganglia, thalamus and the cerebellum possess a low degree of variability in their neuron types. By contrast, cortical structures have evolved in a manner that most closely resembles a relatively sparsely connected network of few principal cell types and many classes of GABAergic interneurons."
"Three major groups of cortical interneurons are recognized: (i) interneurons controlling principal cell output (by perisomatic inhibition), (ii) interneurons controlling the principal cell input (by dendritic inhibition) and (iii) longrange interneurons coordinating interneuron assemblies."
The interesting implication here is that the computation may be shaped and controlled primarily by the interneurons (inhibitory neurons).
The idea of separately controlling cell input and output with additional neurons inspired LSTM (long short-term memory networks). However, LTSM is a classical "average firing rate" network, not a spiking one.
Another observation is that a small number of long-range connections is required so achieve global synchronization by reducing the network diameter
# posted by Notetaker @ 3:12 PM 
