Journal article
Classical and melanopsin photoreception in irradiance detection: negative masking of locomotor activity by light
The European journal of neuroscience, Vol.27(8), pp.1973-1979
04/2008
DOI: 10.1111/j.1460-9568.2008.06168.x
PMCID: PMC2722748
PMID: 18412618
Abstract
Studies in mice lacking either classical or melanopsin photoreception have been useful in describing the photoreceptor contribution to irradiance detection in accessory visual responses. However, application of these findings to irradiance detection in intact animals is problematical because retinal degeneration or manipulation can induce secondary changes in the retina. Among responses dependent on irradiance detection, the suppression of activity by light (negative masking) has had limited study. To further understand the function of classical and melanopsin photoreceptors we studied irradiance and spectral sensitivity of masking by light, primarily in mice with intact retinae. The sensitivity of negative masking was equivalent for medium ( approximately 500 nm) and short wavelengths ( approximately 365 nm) in three strains of wild-type mice, identifying a marked short-wavelength-sensitive-cone input. At medium wavelengths, spectral sensitivity above 500 nm had closest fit to the nomogram for the medium-wavelength-sensitive-cone, but a combined input of cone and melanopsin photoreceptors in wild-type mice seems likely. Under white light a decompression of the irradiance range of masking in C3H rd/rd cl mice, lacking rods and cones, identified a functional deficiency presumably resulting from the absence of classical photoreceptor input. Together the evidence demonstrates a pronounced and sustained classical photoreceptor input to irradiance detection for negative masking, and suggests one role of classical photoreceptor input is to constrain dynamic range.
Details
- Title: Subtitle
- Classical and melanopsin photoreception in irradiance detection: negative masking of locomotor activity by light
- Creators
- Stewart Thompson - Howard Hughes Medical Institute, Department of Ophthalmology and Visual Sciences, University of Iowa, Iowa City, Iowa 52242, USA. stewart-thompson@uiowa.eduRussell G FosterEdwin M StoneVal C SheffieldN Mrosovsky
- Resource Type
- Journal article
- Publication Details
- The European journal of neuroscience, Vol.27(8), pp.1973-1979
- DOI
- 10.1111/j.1460-9568.2008.06168.x
- PMID
- 18412618
- PMCID
- PMC2722748
- NLM abbreviation
- Eur J Neurosci
- ISSN
- 0953-816X
- eISSN
- 1460-9568
- Publisher
- France
- Grant note
- Howard Hughes Medical Institute Wellcome Trust R01 EY010539-05 / NEI NIH HHS
- Language
- English
- Date published
- 04/2008
- Academic Unit
- Stead Family Department of Pediatrics; Iowa Neuroscience Institute; Medical Genetics and Genomics; Ophthalmology and Visual Sciences
- Record Identifier
- 9983979968402771
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