The time it takes to make veridical size and distance judgments

Two experiments measuring the time it takes to make veridical size judgments under normal (unreduced) conditions of viewing showed that RT tended to increase with increases in viewing distance between 122 and 305 cm, even for targets subtending the same visual angle at all distances. Two experiments measuring the time it takes to judge distance under the same conditions did not reveal any difference in RT as a function of the extent-of-distance judged. Established accounts of size perception do not suggest an explanation of these findings.     

Temporal summation at the warmth threshold

Threshold levels for warmth aroused by infrared irradiation were measured in sLx Ss at durations between 0.05 and 10 sec. Beyond a critical duration of about a second, the threshold does not depend on duration. Below critical duration time t trades for irradiance ? by the formula ? = kt^?0.82. That these properties do not depend much on areal extent of stimulation was demonstrated by a study that compared temporal summation for two different areas of the same S’s skin. Individual differences in apparent absolute sensitivity were explored under the rubric of the theory of signal detection.     

Reaction time as a measure of summation of warmth

Reaction time (RT) to radiant heat applied to the forehead and to the back was found to decrease monotonically as a function of two variables: intensity (flux density) and areal extent of stimulation. Intensity and area can thus be traded one for the other to preserve a constant RT. It has previously been shown that intensity and area can be traded to preserve a constant degree of apparent warmth, as determined by magnitude estimation. RT and magnitude estimation therefore agree in showing that the warmth sense displays spatial summation, and both show that summation is very great. They also agree in showing that the foreheadés sensitivity greatly exceeds the backés, and the exact trading rules revealed by magnitude estimation and RT agree well at low and moderate intensities.     

Appropriateness of anxiety and drive for affiliation

Anxiety was induced in first/only born and later born subjects by the threatened injection of a harmless drug. Perceived appropriateness of the induced anxiety was manipulated by the experimenter's suggestion that anxiety over an injection was either perfectly natural (appropriate condition) or to be found only in rather nervous and effeminate men (inappropriate condition). The results indicated that the anxiety induction was successful, but that the perceived appropriateness of the anxiety determined the tendency to affiliate. Subjects in the appropriate condition showed a significantly greater tendency to affiliate than did subjects in the inappropriate condition. Birth order was related to anxiety on one of two measures, but was not implicated in the determination of the affiliative tendency.     

Intersensory effects in the psychological refractory period

Two experiments examined reaction time (RT) to each of two stimulus events separated by short interstimulus intervals (1SI). The essential contrast was RT to the second visual signal, RT₂, in auditory-visual (A-V) vs visual-visual (V-V) sequences. With response, certain pairings in Experiment 1, an effect apparently demonstrating a single-channel process (Welford, 1952), was noted. RT₂ was generally faster for A-V as opposed to V-V sequences especially when Ss were uncertain as to the sequence that would occur. At 0-msec ISI, the RT₂ difference between sequences approached the RT! difference. More rapid RT₂ to A-V sequences was also observed with go vs no-go pairings in Experiment 2 when the initial event was a go signal. However, the RT difference disappeared upon error correction, making the RT₂ sequence difference of questionable relevance to the hypothetical single-channel process. RT₂ was more rapid following a null no-go signal when the no-go signal was contrasted with a visual as opposed to auditory go signal. The latter effect was independent of error and is consistent with channel-switching theory (Kristofferson, 1967).