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By H. J. Eysenck (Eds.)

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New york 1937-1st McGraw Hill. octavo. , 477pp. , illus. , index. VG, no DJ.

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For example, if the suppression is caused by pre-excitatory inhibition as Eysenck and Aiba (1957) have earlier suggested or mediated by such mechanism as lateral inhibition which Barlow, Fitz Hugh and Kuffler (1957) have demonstrated in the cat's eye, then the threshold of the red stimulus would become higher in the light adapted than in the dark adapted eye, for both types of inhibition are shown to increase with the increasing level of light adaptation.

This critical value of t gets smaller and smaller with larger values of / x t used. This means that, in order to obtain the phenomenon with shorter durations of the white stimulus, ixt of this stimulus would have to be increased, in other words, its luminance would have to be increased accordingly (more than is needed to compensate the energy loss due to the shortening of the duration). To test the lower limit of the Bunsen-Roscoe range in this phenomenon an extremely intense light source would therefore be required.

This would mean that light adaptation increases the threshold of the red stimulus when t of the white stimulus is kept the same, or, to be more accurate, when ixt of the white stimulus is kept the same (since in the present experiment / is kept constant). e. changing the intensities of both stimuli by an equal amount). This, we have seen,should not change the threshold of the red stimulus. This effect of adaptation becomes more meaningful, however, when we think of it in terms of neural mechanisms involved in the suppression of the red stimulus.

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