In Luria's model, the posterior cortex plays a key role in reception and analysis of sensory information.

• A. Reception and analysis of sensory information.
• B. Regulation of arousal.
• C. Planning.
• D. Motor coordination.

Answer: (A)

In Luria’s framework, the first functional unit is located in the posterior cortex and is responsible for reception and analysis of sensory information. This means the occipital, parietal, and temporal association areas receive raw sensory input and perform the initial perceptual analysis that allows us to recognize and interpret what we see, hear, and feel. It’s the brain’s primary stage of turning sensations into organized percepts that can guide behavior. This contrasts with arousal regulation, which involves brainstem and thalamic systems that control wakefulness; planning and organization of actions, which are linked to the frontal lobes; and motor coordination, which relies on the motor cortex, cerebellum, and related networks. Damage to the posterior cortex typically disrupts perception and sensory analysis rather than arousal, planning, or motor execution.