During perceptual decision-making, responses in the middle temporal (MT) and lateral intraparietal (LIP) areas appear to map onto theoretically defined quantities, with MT representing instantaneous motion evidence and LIP reflecting the accumulated evidence. However, several aspects of the transformation between the two areas have not been empirically tested. We therefore performed multistage systems identification analyses of the simultaneous activity of MT and LIP during individual decisions. We found that monkeys based their choices on evidence presented in early epochs of the motion stimulus and that substantial early weighting of motion was present in MT responses. LIP responses recapitulated MT early weighting and contained a choice-dependent buildup that was distinguishable from motion integration. Furthermore, trial-by-trial variability in LIP did not depend on MT activity. These results identify important deviations from idealizations of MT and LIP and motivate inquiry into sensorimotor computations that may intervene between MT and LIP.

中文翻译：

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决策过程中MT和LIP中信号和噪声的功能分解。

在感知决策过程中，颞中部（MT）和顶侧外侧（LIP）区域的响应似乎映射到理论上定义的数量，MT代表瞬时运动证据，LIP反映累积的证据。但是，这两个领域之间转换的几个方面尚未经过经验检验。因此，我们对个体决策过程中MT和LIP的同时活动进行了多阶段系统识别分析。我们发现猴子的选择基于运动刺激的早期出现的证据，并且MT响应中存在大量的早期运动加权。LIP响应概括了MT的早期加权，并包含了与运动整合区分开来的依赖选择的累积。此外，LIP的逐项试验变异性不取决于MT活动。这些结果确定了与MT和LIP理想化的重大偏离，并激发了对可能介入MT和LIP之间的感觉运动计算的探究。