Male participants (n = 20) will receive the study medication or placebo orally and will be provided water at administration at visits Day 2-4. Placebo and meclizine capsules will be identical in shape, size, and color. The randomization and counterbalancing of the order of dosing will be in charge of Dr. Levin. In order to ensure that the blind procedure is not violated, Dr. Levin (a) will provide the identical capsules for the study to the Study Coordinator in containers labeled "Subject X, day Y", and (b) will have no contact with the participants in the study. Meclizine and placebo will be dispensed by the Study Coordinator under the administrative supervision of Dr. Rosenthal, and under the clinical supervision of a study physician. During the resting period between pill ingestion and the experimental task, male participants will be asked to sit in a lab room and read or use the internet. At 20 minutes and 40 minutes post drug, sedation level will be assessed using the scale listed below.