AO1

• one area implicated is the obrifrontal cortex circuit
• OFC sends worry signals and these signals are normally supressed by the caudate nucleus
• in OCD the caudate nuclues is thought to be damaged so it cannot supress the signals which become extremely exited
• serotonin is believed to regulate mood
• if someone has low serotonin then normal transmission of mood relevant information doesn't take place, this means that a person may experience a low mood
• in some cases OCD can be explained by the reduction in the functioning of serotonin system in the brain
• dopamine is the pleasure neurotransmitter
• dopamine gives the feelings of pleasure, addiction, movement and motivation