Final answer:
A reduced level of synchronized neural activity in the frontal lobes is associated with symptoms of generalized anxiety disorder. Correct option is a.
Step-by-step explanation:
A reduced level of synchronized neural activity in the frontal lobes has been associated with symptoms of generalized anxiety disorder. The frontal lobes are responsible for executive functions, such as decision-making, planning, and emotional regulation. When there is a reduction in synchronized activity in this region, it can lead to difficulties in regulating emotions and managing anxiety.
For example, research has shown that cholinergic denervation in the frontal lobes is associated with depressive symptoms in Parkinson's disease and parkinsonian dementia (Bohnen et al., 2007). Additionally, regional depletion of dopamine in the prefrontal cortex of monkeys has been found to cause cognitive deficits (Brozoski et al., 1979).
Therefore, a reduced level of synchronized neural activity in the frontal lobes is most closely associated with symptoms of a generalized anxiety disorder.