Matches in SemOpenAlex for { <https://semopenalex.org/work/W2042899578> ?p ?o ?g. }
Showing items 1 to 45 of
45
with 100 items per page.
- W2042899578 abstract "In an experiment on the human brain using the technique of positron emission tomography (Zeki et al . 1993), we showed that when a subject sees motion in the rings constituting Leviant’s Enigma figure (see figure 1), there is significant increase in regional cerebral blood flow. This increased blood flow occurs in the region of human area V5, specialized for visual motion, and partly overlaps that area. On the basis of this result, we concluded that it is activity in specific visual areas of the cerebral cortex which endows Enigma with the phenomenal property of motion which is not objectively there. This conclusion was criticized by Gregory who thought that the motion is due to the hunting of accomodation in the eye, and is thus generated by the eye and has little to do with the cerebral cortex. Since then I have conducted experiments to answer Gregory’s points and refute his arguments (Zeki 1994). In an editorial in Perception , Gregory (1994) has now made an excellent suggestion which I have seized upon. One way of resolving the issue, Gregory suggests, is to ask subjects with an intra-ocular lens implant or no lens at all whether they can see the motion in the Enigma figure. Gregory remains vague about the motion: he speaks of shimmers and moire patterns. I, on the other hand, am concerned with the most distinctive feature of Enigma , namely the rapid circular motion that is confined to the rings and that reverses direction with prolonged viewing. Mr Timothy ffytche FRCS, ophthalmologist, agreed to consecutively show the Enigma figure to three patients who had had both lenses removed and replaced with implants. (These patients had lost the mechanism for accomodation and therefore, if they could detect the motion in the rings, the explanation must lie elsewhere than in the ‘hunting of accommodation’ favoured by Gregory.) In fact, the result was quite conclusive: without prompting, the patients rapidly referred to motion in the rings. Confidence in their observation was heightened by the fact that they spontaneously described the motion as reversing direction, which is what also happens when normal observers view Enigma . In addition to this, I had the opportunity to present this same figure to a patient who had had the same operation in one eye only, two weeks before. When viewing this figure through the eye with a replacement lens, he commented spontaneously on the motion in the ring (‘especially the outer ring’) and reported seeing much the same thing when he viewed the figure through the unoperated eye." @default.
- W2042899578 created "2016-06-24" @default.
- W2042899578 creator A5007924109 @default.
- W2042899578 date "1995-05-22" @default.
- W2042899578 modified "2023-10-16" @default.
- W2042899578 title "Phenomenal motion seen through artificial intra-ocular lenses" @default.
- W2042899578 cites W2047413277 @default.
- W2042899578 cites W2056064562 @default.
- W2042899578 cites W2399419727 @default.
- W2042899578 doi "https://doi.org/10.1098/rspb.1995.0074" @default.
- W2042899578 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/7784434" @default.
- W2042899578 hasPublicationYear "1995" @default.
- W2042899578 type Work @default.
- W2042899578 sameAs 2042899578 @default.
- W2042899578 citedByCount "13" @default.
- W2042899578 crossrefType "journal-article" @default.
- W2042899578 hasAuthorship W2042899578A5007924109 @default.
- W2042899578 hasConcept C104114177 @default.
- W2042899578 hasConcept C154945302 @default.
- W2042899578 hasConcept C15744967 @default.
- W2042899578 hasConcept C169760540 @default.
- W2042899578 hasConcept C41008148 @default.
- W2042899578 hasConceptScore W2042899578C104114177 @default.
- W2042899578 hasConceptScore W2042899578C154945302 @default.
- W2042899578 hasConceptScore W2042899578C15744967 @default.
- W2042899578 hasConceptScore W2042899578C169760540 @default.
- W2042899578 hasConceptScore W2042899578C41008148 @default.
- W2042899578 hasLocation W20428995781 @default.
- W2042899578 hasLocation W20428995782 @default.
- W2042899578 hasOpenAccess W2042899578 @default.
- W2042899578 hasPrimaryLocation W20428995781 @default.
- W2042899578 hasRelatedWork W2029249305 @default.
- W2042899578 hasRelatedWork W2049389369 @default.
- W2042899578 hasRelatedWork W2115571026 @default.
- W2042899578 hasRelatedWork W2144043954 @default.
- W2042899578 hasRelatedWork W2170263972 @default.
- W2042899578 hasRelatedWork W2278250695 @default.
- W2042899578 hasRelatedWork W2511137960 @default.
- W2042899578 hasRelatedWork W2610014769 @default.
- W2042899578 hasRelatedWork W2687972263 @default.
- W2042899578 hasRelatedWork W2898044248 @default.
- W2042899578 isParatext "false" @default.
- W2042899578 isRetracted "false" @default.
- W2042899578 magId "2042899578" @default.
- W2042899578 workType "article" @default.