OCD and Brain Function Worksheet

What does the diathesis-stress model suggest about OCD?

• OCD is entirely caused by genes

• OCD is caused only by environmental factors

• Genes create a vulnerability and stress triggers the disorder

• OCD is not related to either genes or the environment

What does it mean if a disorder is polygenic?

• It is caused by a single dominant gene

• Multiple genetic variations contribute to it

• Only environmental factors are responsible

• It can only be inherited from the mother

Which neurotransmitters are most commonly associated with OCD?

• Insulin and glucose

• Adrenaline and histamine

• Dopamine and serotonin

• Melatonin and acetylcholine

What part of the brain is associated with impaired decision-making in OCD?

• Occipital lobe

• Parietal lobe

• Frontal lobes

• Temporal lobes

What is the function of serotonin in the brain?

• Transport oxygen

• Regulate sleep

• Relay mood-relevant information

• Control balance and coordination

Match the following

• Candidate gene

• Creates vulnerability to OCD by regulating serotonin

• Polygenic

• Different genetic causes in different individuals

• Aetiologically heterogeneous

• Brain area linked to processing unpleasant emotions

• Parahippocampal gyrus

• Involves multiple genes contributing to OCD

How many genes did Taylor (2013) find to be involved in the development of OCD?