Hübner R
Psychologisches Institut, Technische Universität Braunschweig, Germany.
Vision Res. 1996 Feb;36(3):401-8. doi: 10.1016/0042-6989(95)00112-3.
Detection experiments reveal that performance is decreased when the signal's spatial frequency varies unpredictably across trials compared with conditions where it is held constant. However, this effect can more or less be compensated by presenting cues shortly before each trial. To investigate the efficiency of different sensory and symbolic cue types a signal-detection experiment with spatial-frequency uncertainty was carried out. The inter-stimulus interval between cue and signal as well as for the sensory cue types, the spatial overlap between cue and signal, was varied. The results reveal appreciable efficiency differences. While some cues were only of little help, others reduced uncertainty almost entirely. However, the efficiency of cues which were identical to the signals was severely restricted by forward-masking effects when they were presented at the same position as the signal.
检测实验表明，与信号空间频率在各次试验中保持恒定的情况相比，当信号的空间频率在各次试验中不可预测地变化时，表现会下降。然而，通过在每次试验前短时间呈现提示，这种影响或多或少可以得到补偿。为了研究不同感官和符号提示类型的效率，进行了一项具有空间频率不确定性的信号检测实验。提示与信号之间的刺激间隔以及对于感官提示类型而言，提示与信号之间的空间重叠都有所变化。结果显示出明显的效率差异。虽然有些提示帮助不大，但其他提示几乎完全降低了不确定性。然而，与信号相同的提示在与信号相同位置呈现时，其效率受到前掩蔽效应的严重限制。
