Stress-induced Scratching in Healthy and AD

Participants randomized to receive the acute stress condition will undergo the TSST wherein the participant will be introduced to an upcoming task (i.e., job interview) and allowed to prepare (2 minutes). The participant will then be required to speak (job interview) for 4 minutes in front of 2 experimenters. After completion of the interview, participants will be asked to perform a mental arithmetic task for 4 minutes.

Participants randomized to receive the control condition will be watching a landscape video for 10 minutes.