The impact of Sulpiride (600mg; a dopamine antagonist) on behavioural and electrophysiological measures of visuospatial attention and inhibition

This study investigates how the brain's attention system is affected when the chemical dopamine is temporarily reduced using a drug called sulpiride. Researchers want to understand whether changes in dopamine affect whether people pay more attention to the left or right side of their visual field. The findings may one day help understand attention disorders like ADHD. You may be eligible if: - You are between 18 and 45 years old - You are right-handed - You are of European (Caucasian) descent - You are neurologically healthy - If female, you must be taking the combined oral contraceptive pill (both progesterone and oestrogen) You may NOT be eligible if: - You currently smoke or have smoked regularly in your lifetime - You have or have had any neurological or psychiatric illness - You have used illicit drugs in the last 6 months - You are pregnant or breastfeeding Talk to your doctor about whether this trial might be right for you.