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首页> 外文期刊>The European Journal of Neuroscience >Mechanisms of human motion perception: combining evidence from evoked potentials, behavioural performance and computational modelling.
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Mechanisms of human motion perception: combining evidence from evoked potentials, behavioural performance and computational modelling.

机译：人体运动知觉的机制：结合来自诱发电位，行为表现和计算模型的证据。

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Based on single cell recordings in monkey, it has been suggested that neural activity can be related directly to psychophysically measured threshold behaviour. Here, we investigated in humans whether evoked potentials correlate with behavioural measurements like discrimination thresholds and reaction time. Subjects were asked to report the perceived direction of object motion stimuli which contained variable amounts of coherent motion. Simultaneously, we recorded evoked potentials with a multielectrode array, or measured the reaction time. We show here that motion coherence had a strong influence on both amplitude and latency of the evoked potential. Stronger motion signals evoked stronger and faster cortical responses. The latency reduction of the motion onset response with increasing coherence correlated very well with the concurrent decrease in reaction time. Taken together, these results suggest that temporal integration is an important step in analysing motion signals to generate a reliable behavioural response. We stimulated a two-dimensional array of correlation-type motion detectors with the same motion sequences, and analysed the distribution of local motion signals according to signal detection theory. Performance resembled that of human subjects when the decision strategy was optimized so as to exclude small signals and, in particular, when the ideal observer had some knowledge about a region of interest in which the object was to be expected.
机译：基于猴子的单细胞记录，已经表明神经活动可以与心理上测量的阈值行为直接相关。在这里，我们在人类中调查了诱发电位是否与行为测量（如辨别阈值和反应时间）相关。要求受试者报告对象运动刺激的感知方向，其中包含变化量的连贯运动。同时，我们用多电极阵列记录诱发电位，或测量反应时间。我们在这里表明运动连贯性对诱发电位的幅度和潜伏期都有很大的影响。运动信号越强，皮质反应越强。运动开始响应的潜伏期减少与相干性的提高与反应时间的同时减少密切相关。综上所述，这些结果表明时间整合是分析运动信号以生成可靠行为响应的重要步骤。我们用相同的运动序列刺激了一个二维阵列的相关型运动检测器，并根据信号检测理论分析了局部运动信号的分布。当优化决策策略以排除小信号时，特别是当理想的观察者对目标对象所在的感兴趣区域有一定了解时，其表现类似于人类受试者的表现。

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