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Campbell FW, Maffei L. Electrophysiological evidence for the existence of orientation and size detectors in the human visual system. J Physiol. 1970;207(3):635-52doi: 10.1113/jphysiol.1970.sp009085.
Campbell, F. W., & Maffei, L. (1970). Electrophysiological evidence for the existence of orientation and size detectors in the human visual system. The Journal of physiology, 207(3), 635-52. https://doi.org/10.1113/jphysiol.1970.sp009085
Campbell, F W, and Maffei, L. "Electrophysiological evidence for the existence of orientation and size detectors in the human visual system." The Journal of physiology vol. 207,3 (1970): 635-52. doi: https://doi.org/10.1113/jphysiol.1970.sp009085
Campbell FW, Maffei L. Electrophysiological evidence for the existence of orientation and size detectors in the human visual system. J Physiol. 1970 May;207(3):635-52. doi: 10.1113/jphysiol.1970.sp009085. PMID: 5499740; PMCID: PMC1348732.
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J Physiol. 1970 May;207(3):635-52. doi: 10.1113/jphysiol.1970.sp009085.

Electrophysiological evidence for the existence of orientation and size detectors in the human visual system.

The Journal of physiology

F W Campbell, L Maffei

PMID: 5499740 PMCID: PMC1348732 DOI: 10.1113/jphysiol.1970.sp009085
Free PMC Article

Abstract

1. The evoked potential in response to a grating alternating in phase at 8 c/s was recorded as a function of contrast from the occiput of man.2. It was found that a linear relation exists between the log. of contrast and the amplitude of the evoked potential.3. Extrapolation to zero amplitude voltage of the regression line between the amplitude of the evoked potential and log. contrast predicts the psychophysical threshold. This law was found to hold over the wide range of spatial frequencies tested.4. Below 3 c/deg the results are best fitted with two regression lines; one of these is generated from the foveal and the other from the parafoveal representation in the cortex.5. The slope of the regression lines was found to be almost independent of either the spatial frequency or the area of the stimulus grating.6. The slope of the regression lines could be markedly increased by using as a stimulus either two different spatial frequencies, or two different orientations, presented simultaneously.7. Using the evoked potential the selectivity to orientation was found to be so high that a channel was not influenced by another orientation 15 degrees away.8. The channels selectively sensitive to spatial frequency were highly selective and were not influenced by another spatial frequency one octave removed in spatial frequency.9. It is concluded that in man there exist neurones highly selective to both orientation and spatial frequency.

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References

  1. J Physiol. 1965 Dec;181(3):576-93 - PubMed
  2. J Physiol. 1966 Nov;187(2):427-36 - PubMed
  3. J Physiol. 1968 Mar;195(1):215-43 - PubMed
  4. J Physiol. 1969 Jul;203(1):237-60 - PubMed
  5. Nature. 1965 Oct 9;208(5006):191-2 - PubMed
  6. J Neurophysiol. 1965 Mar;28:229-89 - PubMed
  7. Science. 1970 Jan 23;167(3917):386-7 - PubMed
  8. J Physiol. 1968 Sep;198(1):237-50 - PubMed
  9. J Physiol. 1966 Nov;187(2):437-45 - PubMed
  10. Nature. 1967 Dec 16;216(5120):1123-5 - PubMed
  11. J Neurophysiol. 1964 May;27:366-93 - PubMed
  12. J Physiol. 1961 Dec;159:203-21 - PubMed
  13. J Physiol. 1962 Jan;160:106-54 - PubMed
  14. J Physiol. 1969 Jul;203(1):223-35 - PubMed
  15. J Physiol. 1959 Oct;148:574-91 - PubMed
  16. J Physiol. 1966 Dec;187(3):517-52 - PubMed
  17. J Physiol. 1968 Aug;197(3):551-66 - PubMed

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