" The Parietal Lobes "
SENSORY INFORMATION MUST BE ANALYZED in a variety of ways, (a process referred to as congition), in order to allow the brain to produce appropriate behavior.
Much of this process of analysis is carried out by the posterior Parietal cortex. It is with the integration of this sensory input that we begin to find evidence for the processes of Thought and Cognition. 
We have seen the inputs of the various sensory systems as being independent, and yet we experience a sensory event as a single perceptual experience. The ability of the mind to recognize concurrent sensory signals as a single «Percept» is known as Cross-Modal Matching. This can occur with any combination of visual, auditory, and somesthetic stimuli; in each case the matching is assumed to occur in the tertiary cortical regions where the inputs overlap.
Parietal Lobes include the Post-Central Gyrus which correlates with (Brodmann's Areas 1, 2, and
3), the Superior Parietal Lobe
(Areas 5 and
7), the Inferior Parietal Lobe
(Areas 40 and
43), and the Angular Gyrus
(Area 39).
The principal afferents to the Post-Parietal Cortex project from the Pulvinar in the Posterior Thalamus. The Parietal lobe then sends its major projections to the Frontal and Temporal association cortex, as well as to subcortical structures including the Pulvinar and posterior region of the Striatum , Mid Brain, and Spinal Cord. The corticocortical projections to the Frontal lobe provide sensory input to the Frontal lobe (as there are no direct sensory projections to this region).
The Post-Parietal Cortex is specialized primarily for integrating sensory input from Somatic and Visual regions.
It appears to play a major role in the recognition of, and even possibly the production of abstract stimuli; (those processes needed for such abilities as reading and arithmetic).
The Parietal Cortex is involved in forming «Unitary Percepts» from diverse sensory events, it is involved in coding spacial locations of sensory information, and it is involved in forming abstract concepts. It therefore seems most likely that it is also involved in manipulating the spacial coordinates of abstract (or mental) stimuli. Hence, if one is asked to imagine looking at a motorcycle and then draw it from the perspective of the rider, it is necessary to manipulate the mental representation of the motorcycle to draw it.
The fact that we can accurately intercept a flying ball, implies that the brain can distinguish between the movement generated by the ball's velocity and the movement of the head. This process of discernment is known as Reafference. The motor systems inform the sensory systems of the movements that are made - which allows the sensory system to subtract the movement from that of the object.
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