A comment: Mackay Rays shimmer due to accommodation changes
1993; Royal Society; Volume: 253; Issue: 1336 Linguagem: Inglês
10.1098/rspb.1993.0090
ISSN1471-2954
Autores Tópico(s)Ocular and Laser Science Research
ResumoRestricted accessMoreSectionsView PDF ToolsAdd to favoritesDownload CitationsTrack Citations ShareShare onFacebookTwitterLinked InRedditEmail Cite this article Gregory Richard Langton 1993A comment: Mackay Rays shimmer due to accommodation changesProc. R. Soc. Lond. B.253123http://doi.org/10.1098/rspb.1993.0090SectionRestricted accessArticleA comment: Mackay Rays shimmer due to accommodation changes Richard Langton Gregory Google Scholar Find this author on PubMed Search for more papers by this author Richard Langton Gregory Google Scholar Find this author on PubMed Published:22 July 1993https://doi.org/10.1098/rspb.1993.0090AbstractMackay (1957) reported visual shimmer and chrysanthemum-like patterns seen when looking at a display of lines converging to a central point: 'Mackay Rays'. Mackay attributed the shimmer to some central brain effect, related to the high information redundancy of the figure. The answer seems more prosaic. The chrysanthemum patterns show every sign of being moiré patterns, given by displaced afterimages, as they are very similar to the moiré patterns produced by overlaying the Ray figure with its slightly shifted transparency. A simple observation suggests an optical origin for the shimmer. When the Ray or other repeated-line patterns (including Leviant's 'traffic illusion') are viewed through a pin-hole the shimmer disappears. As the pin-hole increases the depth of field of the optics of the eye, so the usual small continual fluctuations in accommodation (focusing) of the lens have small or no effect. This strongly suggests that the dynamic shimmer seen in these static figures has an optical cause: changes of size of the retinal image, due to the usual rapid 'hunting' of accommodation (Alpern 1962) giving retinal motion signals. As measured with a high-speed infrared optometer (Campbell et al. 1959), the oscillatory changes of focus of the lens of the eye have large individual differences and are affected by various conditions, but generally there is a maximum amplitude around 0.5 Hz and another peak around 2 Hz. The amplitude can be nearly half a dioptre.FootnotesThis text was harvested from a scanned image of the original document using optical character recognition (OCR) software. As such, it may contain errors. Please contact the Royal Society if you find an error you would like to see corrected. Mathematical notations produced through Infty OCR. Previous Article VIEW FULL TEXT DOWNLOAD PDF FiguresRelatedReferencesDetailsCited by Thornton I and Zdravković S (2019) Searching for illusory motion, Attention, Perception, & Psychophysics, 10.3758/s13414-019-01750-3, 82:1, (44-62), Online publication date: 1-Jan-2020. 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