S-, M- and L-cone contributions to human pupil responses under dim illumination conditions
نویسندگان
چکیده
منابع مشابه
Assessing rod, cone, and melanopsin contributions to human pupil flicker responses.
PURPOSE We determined the relative contributions of rods, cones, and melanopsin to pupil responses in humans using temporal sinusoidal stimulation for light levels spanning the low mesopic to photopic range. METHODS A four-primary Ganzfeld photostimulator controlled flicker stimulations at seven light levels (-2.7 to 2 log cd/m(2)) and five frequencies (0.5-8 Hz). Pupil diameter was measured ...
متن کاملMelanopsin- and L-cone–induced pupil constriction is inhibited by S- and M-cones in humans
The human retina contains five photoreceptor types: rods; short (S)-, mid (M)-, and long (L)-wavelength-sensitive cones; and melanopsin-expressing ganglion cells. Recently, it has been shown that selective increments in M-cone activation are paradoxically perceived as brightness decrements, as opposed to L-cone increments. Here we show that similar effects are also observed in the pupillary lig...
متن کاملSelectivity of human retinotopic visual cortex to S-cone-opponent, L/M-cone-opponent and achromatic stimulation.
Our aim was to make a quantitative comparison of the response of the different visual cortical areas to selective stimulation of the two different cone-opponent pathways [long- and medium-wavelength (L/M)- and short-wavelength (S)-cone-opponent] and the achromatic pathway under equivalent conditions. The appropriate stimulus-contrast metric for the comparison of colour and achromatic sensitivit...
متن کاملThe perception of speed based on L-M and S-(L+M) cone opponent processing
We have measured perceived speed and speed discrimination thresholds for stimuli that selectively activate the L-M, S-(L+M) cone opponent and L+M (luminance) post-receptoral pathways. For low speeds and low contrasts speed discrimination thresholds for L-M and S-(L+M) are similar but are higher and have a greater dependency upon contrast than those for luminance motion. These differences betwee...
متن کاملThe human S-cone electroretinogram and its variation among subjects with and without L and M-cone function.
PURPOSE To examine the S-cone ERG in subjects with and without L and M-cone function. METHODS Ganzfeld spectral flashes in the presence of strong Ganzfeld adapting fields are used to elicit S-cone ERGs. RESULTS The S-cone ERG b-wave ranges from 0.2 to 4 mV in amplitude and 38-45 msec in implicit time. There is a progressive decrease in amplitude with age. The response is similar in subjects...
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ژورنال
عنوان ژورنال: Journal of Vision
سال: 2013
ISSN: 1534-7362
DOI: 10.1167/13.15.37