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If you take part, we will ask you to: - Provide a cheek swab (to see which form of the gene you have) then, if suitable, come to the lab and: - Take a single dose of a drug or a dummy pill; - Fill in some questionnaires and give samples of saliva; - Complete tasks of mental maths, memory and reward, while in an MRI brain scanner. The study will take one afternoon (around 3.5 hours).

(MSD-IDREC R26521/RE001)

We are looking for

If you are a healthy non-smoking man aged between 18 and 40, we invite you to take part in a study to assess how a gene and a drug interact to affect mental performance and brain activity.

Expenses

Participants will be reimbursed for their time and travel expenses.