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Direction selectivity is computed by active dendritic integration in retinal ganglion cells
Benjamin Sivyer1, Stephen R Williams
1Queensland Brain Institute, The University of Queensland, Brisbane, Australia.
Nature Neuroscience
|October 29, 2013
Summary
Active dendritic integration enables direction selectivity in retinal ganglion cells. This process involves dendritic spikes amplified for preferred directions and inhibited for null directions in the retina.
Area of Science:
- Neuroscience
- Computational Neuroscience
- Retinal Physiology
Background:
- Active dendritic integration is theorized to enhance neuronal computational capacity.
- The specific role of active dendritic processing in intact neural computations remains underexplored.
Purpose of the Study:
- To investigate the role of active dendritic integration in neuronal computations within intact neural networks.
- To demonstrate the direct involvement of active dendritic processing in direction selectivity in the retina.
Main Methods:
- Utilized multi-site electrophysiological recording techniques.
- Recorded from rabbit retinal ganglion cells.
Main Results:
- Demonstrated that active dendritic integration underlies direction selectivity computation.
- Observed dendritic spike generation in terminal dendrites for preferred-direction stimuli, with amplification along the dendritic arbor.
- Showed that synaptic inhibition vetoes neuronal output for null-direction stimuli by inhibiting dendritic spike initiation.
Conclusions:
- Active dendritic integration is crucial for computing direction selectivity in retinal ganglion cells.
- This study provides evidence for a physiologically engaged, circuit-based computation in the retina mediated by active dendritic integration.
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