Correlated neuronal discharge rate and its implications for psychophysical performance (original) (raw)
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- Published: 14 July 1994
Nature volume 370, pages 140–143 (1994)Cite this article
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Abstract
SINGLE neurons can signal subtle changes in the sensory environment with surprising fidelity, often matching the perceptual sensitivity of trained psychophysical observers1–10. This similarity poses an intriguing puzzle: why is psychophysical sensitivity not greater than that of single neurons? Pooling responses across neurons should average out noise in the activity of single cells, leading to substantially improved psychophysical performance. If, however, noise is correlated among these neurons, the beneficial effects of pooling would be diminished10–12. To assess correlation within a pool, the responses of pairs of neurons were recorded simultaneously during repeated stimulus presentations. We report here that the observed covariation in spike count was relatively weak, the correlation coefficient averaging 0.12. A theoretical analysis revealed, however, that weak correlation can limit substantially the signalling capacity of the pool. In addition, theory suggests a relationship between neuronal responses and psychophysical decisions which may prove useful for identifying cell populations underlying specific perceptual capacities.
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Authors and Affiliations
- Department of Neurobiology, Stanford University School of Medicine, Stanford, California, 94305, USA
Ehud Zohary, Michael N. Shadlen & William T. Newsome
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- Ehud Zohary
You can also search for this author inPubMed Google Scholar - Michael N. Shadlen
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Zohary, E., Shadlen, M. & Newsome, W. Correlated neuronal discharge rate and its implications for psychophysical performance.Nature 370, 140–143 (1994). https://doi.org/10.1038/370140a0
- Received: 14 March 1994
- Accepted: 25 May 1994
- Issue Date: 14 July 1994
- DOI: https://doi.org/10.1038/370140a0