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Photo Research Corporation, 837 North Cahuenga Blvd., Hollywood, California.
The test stimulus in this and subsequent experiments, though small, definitely is not a point source. As spatial position is not varied and as there are no boundaries near the test, it is probable that the observed test-threshold changes are quite similar (though not exactly equivalent) to those that would have been observed with a point test. Preliminary observations support this assumption.
The pre-adaptation field used in Exp. 2 is larger than the one used in Exp. 1, but as both are substantially larger than the test, their masking effect is similar (see for example, Battersby et al.2).
In an earlier investigation of chromatic interactions in masking, Bush17 failed to note a similar second peak. However, his masking stimulus (560 msec) and test (40 msec) were orders of magnitude longer than those used here.
For a preliminary account of this experiment see G. Sperling, Am. Psychol. 17, 354 (1962).
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Actually, eT=0.022eM was presented on catch trials as it was inconvenient to produce eT=0 without informing the subject. This test stimulus contained about the energy of the previously determined threshold. The identity of the observers' distribution of responses to the "blank" and to the next-more-intense stimulus ultimately justified its use.
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See above section, Masking by Impulse Flashes, p. 546.
No assumption is made about the time τ at which max eT*(τ) occurs.
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Onley and Boynton's19 data show instances where increasing masking luminance does not produce increases in thresholds of tests which nominally occurred at 0.0 msec (coincidence of onsets). This result is more likely to have occurred at negative times (test flash preceding) than at 0.0.
H. D. Baker, J. Opt. Soc. Am. 45, 839 (1955), p. 843.
See Ref. 14, p. 284; also Ref. 1, p. 758.