Volunteers needed - Chance to win £30!

I need volunteers to take part in my third year psychology project.

Everyone that takes part in my study will receive chocolate as a thank you gift and will be entered into a raffle with other participants to win £30. There's also a pair of cinema tickets to be won.

You will be given a specific dose of caffeine or vitamin C tablets and asked to perform certain tasks. The dose is equal to that of two cups of coffee - you won't be at any risk. The tasks involve button pressing and making models out of Lego.

I need native English speakers, male and female. You will need to complete two 45 minute sessions to be entered into the prize draw.

If you're interested in taking part, please send me a message and I'll get back to you. (I am looking for participants both now and/or after Christmas.)