McKinley R C, Weber D L
AL/OEBN, Wright-Patterson AFB, Ohio 45433-7901.
J Acoust Soc Am. 1994 May;95(5 Pt 1):2642-51. doi: 10.1121/1.409833.
This study examined the effect of multiple presentations on signal detection and on signal recognition (identifying one signal from a set of four possible signals) for three different sets of signals. One set was four sinusoids (100-ms duration, frequencies of 707, 1000, 1414, and 2000 Hz). Two sets contained tonal patterns each made of a sequence of seven, 100-ms, sinusoidal components. In the first set, the four patterns consisted of the same seven sinusoids in different orders. In the second set, the four patterns had the same order of relative frequencies, but had frequencies from different 1/4 oct bands centered at 707, 1000, 1414, and 2000 Hz. All stimuli were adjusted to be equally detectable in the presence of a continuous white noise (eta 0 = 20 dB SPL). Each trial contained 1, 2, 4, 8, or 16 presentations of a given signal plus noise (probability of a signal was 0.5) or noise alone. Detectability of the sinusoids generally increased as the square root of the number of presentations; detectability for the tonal patterns increased at a slower rate. Recognition was generally poorer than predicted by the recognition theorem [S.J. Starr, C. E. Metz, L.B. Lusted, and D.J. Goodenough, Radiology 116, 533-538 (1975)] and increased with multiple presentations only as much as expected from the increase in signal detectability.
本研究考察了多次呈现对三种不同信号集的信号检测及信号识别（从四个可能信号的集合中识别出一个信号）的影响。其中一组信号是四个正弦波（持续时间100毫秒，频率分别为707、1000、1414和2000赫兹）。另外两组包含音调模式，每组由七个100毫秒的正弦波分量序列组成。在第一组中，四种模式由相同的七个正弦波以不同顺序组成。在第二组中，四种模式具有相同的相对频率顺序，但频率来自以707、1000、1414和2000赫兹为中心的不同1/4倍频程频段。所有刺激在连续白噪声（等效阈声压级0 = 20分贝声压级）存在的情况下被调整为具有同等可检测性。每次试验包含给定信号加噪声（信号出现概率为0.5）或仅噪声的1、2、4、8或16次呈现。正弦波的可检测性通常随着呈现次数的平方根增加；音调模式的可检测性以较慢的速率增加。识别通常比识别定理[斯塔，C.E.梅茨，L.B.卢斯特，和D.J.古德诺夫，《放射学》116，533 - 538（1975年）]预测的要差，并且仅随着多次呈现而增加，增加的幅度仅与信号可检测性的增加所预期的一样多。
