双流假说(英语:two-streams hypothesis)是一个颇具影响力的视觉信息神经处理模型。[1][2] 这一假说认为人类大脑中拥有两种视觉系统,当视觉信息从枕叶传出后经由两条路径传递,其中参与物体识别的腹流(ventral stream)进入颞叶,而参与空间位置信息处理的背流(dorsal stream)则最终进入顶叶。因而腹流又被称为内容通路(what pathway),背流又被称为空间通路(where pathway)。[3]

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背流(绿色;顶叶)与腹流(紫色;颞叶)源于视觉皮层的同一区域。

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