Definition: A nomothetic approach attempts to establish general laws or principles that apply to all cases.

Example: Different individuals may experience varying obsessions and compulsions, suggesting the need for more personalized study approaches.

Highlight: The two-process model offers an alternative behavioral explanation, emphasizing learning through classical and operant conditioning.

Definition: The basal ganglia is a cluster of neurons at the brain's base involved in movement coordination.

Highlight: PET scans reveal increased activity in the orbitofrontal cortex of OCD patients, potentially explaining both obsessive thoughts and compulsive behaviors.

Example: Twin studies conducted by Billet et al demonstrated that identical twins have twice the risk of developing OCD compared to fraternal twins.