The gamma response to colour hue in humans: evidence from MEG
| Autor: | Philippa C. H. Bothwell, Krish D. Singh, Colette C. Milbourn, Nathan W. Taylor, Gavin Perry, Georgina Powell |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Male
Frequency response Light genetic structures Stimulation Monkeys Systems Science Spectrum Analysis Techniques Nuclear magnetic resonance Medicine and Health Sciences Frequency Response Visual Cortex Mammals Cerebral Cortex Physics Radiation Gamma Radiation Multidisciplinary medicine.diagnostic_test Electromagnetic Radiation Magnetoencephalography Eukaryota Brain Signal Filtering medicine.anatomical_structure Vertebrates Physical Sciences Medicine Engineering and Technology Female Occipital Lobe Anatomy Color Perception Macaque Research Article Adult Primates Computer and Information Sciences Visible Light Science Color Research and Analysis Methods Gamma Spectrometry Young Adult Old World monkeys medicine Humans Animals Chromatic scale Nuclear Physics Hue Biology and life sciences Organisms Butterworth Filters Electrophysiology Luminance Visual cortex Amniotes Signal Processing CIELUV Zoology Photic Stimulation Mathematics |
| Zdroj: | PLoS ONE PLoS ONE, Vol 15, Iss 12, p e0243237 (2020) |
| ISSN: | 1932-6203 |
| Popis: | It has recently been demonstrated through invasive electrophysiology that visual stimulation with extended patches of uniform colour generates pronounced gamma oscillations in the visual cortex of both macaques and humans. In this study we sought to discover if this oscillatory response to colour can be measured non-invasively in humans using magnetoencephalography. We were able to demonstrate increased gamma (40–70 Hz) power in response to full-screen stimulation with four different colour hues and found that the gamma response is particularly strong for long wavelength (i.e. red) stimulation, as was found in previous studies. However, we also found that gamma power in response to colour was generally weaker than the response to an identically sized luminance-defined grating. We also observed two additional responses in the gamma frequency: a lower frequency response around 25–35 Hz that showed fewer clear differences between conditions than the gamma response, and a higher frequency response around 70–100 Hz that was present for red stimulation but not for other colours. In a second experiment we sought to test whether differences in the gamma response between colour hues could be explained by their chromatic separation from the preceding display. We presented stimuli that alternated between each of the three pairings of the three primary colours (red, green, blue) at two levels of chromatic separation defined in the CIELUV colour space. We observed that the gamma response was significantly greater to high relative to low chromatic separation, but that at each level of separation the response was greater for both red-blue and red-green than for blue-green stimulation. Our findings suggest that the stronger gamma response to red stimulation cannot be wholly explained by the chromatic separation of the stimuli. |
| Databáze: | OpenAIRE |
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