On binocular flicker and the correlation of activity of 'corresponding' retinal points / by C. S. Sherrington.

  • Charles Scott Sherrington
Date:
[1904]
Catalogue details

Licence: In copyright

Credit: On binocular flicker and the correlation of activity of 'corresponding' retinal points / by C. S. Sherrington. Source: Wellcome Collection.

Provider: This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London)

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    These grades were except the first obtained by using an episkotister in front of the one of the lantern windows chosen to furnish image Z, the physical luminosity numerically denoted above therefore involves a time unit, e.g., a second, or a revolution, either of the cylindrical lantern for p, X or R, or of the episkotister for L. Lest it be thought that the physical intermittence of the unflickering image was possibly of influence or a possible complication, it must be stated that the rate of the episkotister was far above that necessary to extinguish all trace of flicker from the visual image. Also, it was by experiment found that increasing or diminishing the speed of the episkotister by half did not modify the result, so long always as its speed remained above that necessary to extinguish flicker. Moreover for the determination where Z = 12 no episkotister but a steady light was used, and yet the measurement obtained was the same. Diagram 10. The heights of the L s represent their physical luminosities not the fre- quencies of intermittence for extinction of their flicker. The amount by which the fusion-point {i.e, the point of speed at which flicker was extinguished) for image LR lay lower than that for the standard \p, or for R, was taken as measure of the influence of the continuous steady image upon the flickering one. The results observed are given in Table IV. opposite.
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