Which brain region is associated with early visual hallucinations involving shapes, orientation, and patterns?

• A. Occipital cortex
• B. Frontal cortex
• C. Temporal cortex
• D. Parietal cortex

Answer: (A)

Early, simple visual experiences like shapes, lines, orientation, and repeating patterns come from the occipital cortex, the brain’s primary visual processing area at the back of the head. This region analyzes basic visual features—edges, angles, movement—and when its activity is distorted or spontaneously activated (as can happen with migraines, seizures, or certain drugs), it produces geometric hallucinations such as shapes, spirals, or zigzags. The frontal cortex handles planning and executive functions, not the origin of these basic visuals. The temporal cortex deals with higher-level visual processing, memory, and object recognition, which relate to more complex perceptions rather than initial, simple visual content. The parietal cortex contributes to spatial awareness and attention but does not typically generate these early visual phenomena.