Acoustic cues to visual detection: A classification image study
Acoustic cues to visual detection: A classification image study
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DOI：
10.1167/11.6.7
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发表时间：
2011-01-01
影响因子：
1.8
通讯作者：
Baldassi, Stefano
中科院分区：
文献类型：
--
作者：
Pascucci, David;Megna, Nicola;Baldassi, Stefano
已知非信息性声音可以提高同步视觉目标的对比度检测阈值（M。Lippert，N. K. Logothetis，& C. Kayser，2007）。我们研究了这种跨模态效应的机制的时空特征，方法是使用一种分类图像范式，该范式特别适合于研究跨空间和时间的感知模板（P. Neri & D. J. Heeger，2002年）。一个明亮的酒吧嵌入在2D（时空）动态噪声和观察者被要求检测其存在的单峰（仅视觉）和双峰（视听）条件。进行分类图像分析，并推导出一阶和二阶核。我们的研究结果表明，跨模态的促进检测包括在减少活动的早期机制引起的发病的刺激，而不是直接参与识别的目标。事实上，声音通过抑制目标之前的激活来锐化2阶内核（涉及目标检测），而它不影响1阶内核。这些数据表明，声音会影响一些非线性过程中涉及的视觉刺激的检测，减少对比度能量过滤器的活动时间与目标无关，从而减少时间的不确定性。
A non-informative sound is known to improve contrast detection thresholds for a synchronous visual target (M. Lippert, N. K. Logothetis, & C. Kayser, 2007). We investigated the spatio-temporal characteristics of the mechanisms underlying this crossmodal effect by using a classification image paradigm specifically suited to investigate perceptual templates across both space and time (P. Neri & D. J. Heeger, 2002). A bright bar was embedded in 2D (space-time) dynamic noise and observers were asked to detect its presence in both unimodal (only visual) and bimodal (audio-visual) conditions. Classification image analysis was performed and the 1st and 2nd order kernels were derived. Our results show that the cross-modal facilitation of detection consists in a reduction of activity of the early mechanisms elicited by the onset of the stimulation and not directly involved in the identification of the target. In fact, the sound sharpens the 2nd order kernels (involved in target detection) by suppressing the activation preceding the target, whereas it does not influence the 1st order kernels. These data suggest that the sound affects some non-linear process involved with the detection of a visual stimulus by, decreasing the activity of contrast energy filters temporally uncorrelated with the target, hence reducing temporal uncertainty.