Answer
Perceptions of changes in the internal and external environments are perceived mainly in centers within the cerebral cortex.
Work Step by Step
Some stimuli from receptors may not need to go to the brain for responses, but are handled by simple reflex arcs. However, most sensory stimuli reach centers in the cerebral cortex--in some cases ipsilateral cortical centers, and in other cases contralateral sensory centers for integration and responses.
