Is the visual dorsal stream really very visual after all?

The perception-action model (PAM) provides a misleading account of the core function of the dorsal stream: which is the integration of sensory signals to create dynamic representations of corporeal and extrapersonal space. Recent evidence suggests that the parietal-occipital cortex plays a key role in integrating multimodal spatial signals that relate to the direction of gaze and the direction of reaching movements. I suggest that a core deficit of the 'dorsal' streamoptic ataxia-arises because of an inability to simultaneously represent different multimodal spatial representations.