Kerzel Dirk, Gauch Angélique, Buetti Simona
Faculté de Psychologie et des Sciences de l'Éducation, Université de Genève, Switzerland.
J Vis. 2010 Oct 1;10(12):12. doi: 10.1167/10.12.12.
Improvements of perceptual performance following the presentation of peripheral cues have been ascribed to accelerated accrual of information, enhanced contrast perception, and decision bias. We investigated effects of peripheral cues on the perception of Gabor and letter stimuli. Non-predictive, peripheral cues improved perceptual accuracy when the stimuli were masked. In contrast, peripheral cues degraded perception of low-contrast letters and did not affect the perception of low-contrast Gabors. The results suggest that involuntary attention accelerates accrual of information but are not entirely consistent with the idea that involuntary attention enhances subjective contrast. Rather, peripheral cues may cause crowding with single letter targets of low contrast. Further, we investigated the effect of the amount of uncertainty on involuntary attention. Cueing effects were (initially) larger when there were more possible target locations. In addition, cueing effects were larger when error feedback was absent and observers had no knowledge of results. Despite these strategic factors, location uncertainty was not sufficient to produce cueing effects, showing that location uncertainty paired with non-predictive cues reveals perceptual and not (only) decisional processes.
外周线索呈现后感知性能的改善归因于信息积累加速、对比度感知增强和决策偏差。我们研究了外周线索对Gabor和字母刺激感知的影响。当刺激被掩蔽时，非预测性外周线索提高了感知准确性。相比之下，外周线索降低了低对比度字母的感知，并且不影响低对比度Gabor的感知。结果表明，非自愿注意加速了信息积累，但并不完全符合非自愿注意增强主观对比度的观点。相反，外周线索可能会导致与低对比度单个字母目标的拥挤。此外，我们研究了不确定性程度对非自愿注意的影响。当有更多可能的目标位置时，线索效应（最初）更大。此外，当没有错误反馈且观察者不知道结果时，线索效应更大。尽管存在这些策略因素，但位置不确定性不足以产生线索效应，表明位置不确定性与非预测性线索配对揭示的是感知过程而非（仅）决策过程。
