Final answer:
The parietal lobe depends on its interactions with the visual association cortex and the somatosensory cortex to process complex information and guide movements. The dorsal stream, in particular, plays a key role in collaborating with these cortices to integrate sensory input with motor function, impacting the frontal lobe.
Step-by-step explanation:
The symptoms of the parietal lobe that do not fit into the simple view of a visuomotor control center may depend on the interaction with other brain regions. While the parietal lobe processes somatosensation and proprioception, it is also involved in integrating sensory information from the visual association cortex, which includes areas V2 and V3 surrounding the primary visual cortex (V1). The dorsal and ventral streams are critical in this integration, with the dorsal stream entering the parietal lobe and influencing motor functions through its interaction with the motor cortex in the frontal lobe.
The dorsal stream locates objects in space and helps guide bodily movements based on visual inputs. It collaborates with the somatosensory cortex, which is dedicated to processing touch and sensation proportionate to the surface area and nerve density of the corresponding body part. Together, information from these streams and the processing of proprioceptive data allow for the planning and execution of complex movements and motor responses, influencing frontal lobe activity. This intricate connection and processing underscore why the parietal lobe's function cannot be viewed solely as a visuomotor control center.