抄録
Problem: The functional relation between the time-errors and the length of time intervals was investigated in detail by many authors, but comparatively little has been reported concerning the effect of stimulus durations. The purpose of the present study Was to observe the influence of stimulus duration upon time-errors in the discrimination of auditory intensities, limiting to the case in which the duration of first (standard) stimuli anti of second (variable) ar equal.
Apparatus and procedure: The sound-source was a dynamic cone actuated by an electric tube oscillator. The frequency of tones was 800 v. d. with the exeception of Experiment XIII in which 100 v. d. was used. The temporal relations of stimuli were controlled by means of Aleumann's time-sense apparatus. The method of complete series was used in this study. The intensity of the standard stimuli was 6 Barkhausen phon with the exceptions of the Experiment XI, in which the standard was 3 phon, and of the Experiment XII, in which 9 phon was used as the standard, and in the Experiment XIII standard was not measured by phon. The stimulus durations were varied 1/4 to 21/2s econds. Os were graduate and undergraduate students in psychology and members in our psychological laboratory. The instructions required a judgment upon the second stimulus as stronger than, weaker than, or equal to the first with respect to the intensity.
ResIdts:
(1)The positive time-error increased (or the negative time-error decreased) with the increase in the length of stimlus durations.
(2)When the time-interval between the pair of stimuli was extremely short or two stimuli connected directly without intervening time-interval, the reversed tendency also appeared.
(3)According to my experiments, these tendencies seem to be due to the assimilation between the first tone and its neighbouring time-intervals.
