| Autor: |
Thomas, Ian B., Nicola, Paul Di, Elia, Michael, Pasierbiak, Carl |
| Zdroj: |
Journal of the Acoustical Society of America; 1970, Vol. 48 Issue 1A, p76-77, 2p |
| Abstrakt: |
Fifty listeners heard stimuli consisting of two equal amplitude pure tones (A and B) in sequence followed by a silent period of variable duration T and finally a pure tone X equal in frequency and amplitude to either A or B. The task of the listeners was to decide if the delayed stimulus X corresponded to A or B. The duration of each of the segments A, B, and X was 1.25 sec throughout as was the duration of the silent interval between tones A and B. The duration of the silent interval T ranged from 5 to 110 sec. Pairs of tones of frequencies 500 and 550 Hz, 1000 and 1100 Hz, and 1800 and 1980 Hz were employed. The pair used, the order within pairs, and the order with which variable delays were presented were all randomized. A tape of all stimuli including delays was prepared prior to the experiment; listeners heard the stimuli binaurally in phase at around 80 dB SPL (0.0002 dyn/cm2). Listeners obtained near perfect scores (>90%) for values of T up to 20 sec. Scores then dropped abruptly to about 68% and maintained this level until a value of T of approximately 65 sec at which time scores fell below the 5% significance level (score of 61%) for this test. Work is continuing on tones separated in frequency by values other than 10%. [Work supported by NIH.] [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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