期刊
JOURNAL OF PHYSIOLOGY-LONDON
卷 595, 期 16, 页码 5427-5437出版社
WILEY
DOI: 10.1113/JP273645
关键词
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资金
- State Key Laboratory of Cognitive Neuroscience and Learning
- NSFC [30810103906]
- Jane and Aatos Erkko Foundation
- Leverhulme Trust [RPG-2012-567]
- BBSRC [BB/F012071/1, BB/D001900/1, BB/H013849/1]
- EPSRC [EP/I017909/1]
- Biotechnology and Biological Sciences Research Council [BB/M009564/1, BB/H013849/1, BB/F012071/1, BB/D001900/1] Funding Source: researchfish
- Engineering and Physical Sciences Research Council [EP/I017909/1] Funding Source: researchfish
- BBSRC [BB/D001900/1, BB/H013849/1, BB/F012071/1, BB/M009564/1] Funding Source: UKRI
- EPSRC [EP/I017909/1] Funding Source: UKRI
A photoreceptor's information capture is constrained by the structure and function of its light-sensitive parts. Specifically, in a fly photoreceptor, this limit is set by the number of its photon sampling units (microvilli), constituting its light sensor (the rhabdomere), and the speed and recoverability of their phototransduction reactions. In this review, using an insightful constructionist viewpoint of a fly photoreceptor being an 'imperfect' photon counting machine, we explain how these constraints give rise to adaptive quantal information sampling in time, which maximises information in responses to salient light changes while antialiasing visual signals. Interestingly, such sampling innately determines also why photoreceptors extract more information, and more economically, from naturalistic light contrast changes than Gaussian white-noise stimuli, and we explicate why this is so. Our main message is that stochasticity in quantal information sampling is less noise and more processing, representing an 'evolutionary adaptation' to generate a reliable neural estimate of the variable world.
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