Color-detection thresholds in rhesus macaque monkeys and humans
| Autor: | Adam Butensky, Rosa Lafer-Sousa, Cleo M. Stoughton, Galina Gagin, Reitumetse L Pulumo, Sonja N. Swanbeck, Kaitlin S. Bohon, Jane Qu, Monica A. Gates, Bevil R. Conway, Jiun-Yiing Hu |
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| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Male
medicine.medical_specialty genetic structures Color vision Color space Audiology Macaque Retinal Cone Photoreceptor Cells Contrast Sensitivity Optics Sensory threshold biology.animal medicine Psychophysics Animals Humans biology business.industry Articles biology.organism_classification Macaca mulatta Sensory Systems Ophthalmology Rhesus macaque Sensory Thresholds Fixation (visual) Female business Color Perception |
| Popis: | Macaque monkeys are a model of human color vision. To facilitate linking physiology in monkeys with psychophysics in humans, we directly compared color-detection thresholds in humans and rhesus monkeys. Colors were defined by an equiluminant plane of cone-opponent color space. All subjects were tested on an identical apparatus with a four-alternative forced-choice task. Targets were 2° square, centered 2° from fixation, embedded in luminance noise. Across all subjects, the change in detection thresholds from initial testing to plateau performance (“learning”) was similar for +L − M (red) colors and +M − L (bluish-green) colors. But the extent of learning was higher for +S (lavender) than for −S (yellow-lime); moreover, at plateau performance, the cone contrast at the detection threshold was higher for +S than for −S. These asymmetries may reflect differences in retinal circuitry for S-ON and S-OFF. At plateau performance, the two species also had similar detection thresholds for all colors, although monkeys had shorter reaction times than humans and slightly lower thresholds for colors that modulated L/M cones. We discuss whether these observations, together with previous work showing that monkeys have lower spatial acuity than humans, could be accounted for by selective pressures driving higher chromatic sensitivity at the cost of spatial acuity amongst monkeys, specifically for the more recently evolved L − M mechanism. |
| Databáze: | OpenAIRE |
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