This project will use a new form of non-invasive brain stimulation called high-definition transcranial direct current stimulation (HD-tDCS) to facilitate verbal learning. This form of stimulation is similar to transcranial direct current stimulation (tDCS) but allows for more spatially focused stimulation. We hypothesise that HD-tDCS when applied to regions of the brain important for learning and memory will improve verbal learning and memory compared to sham HD-tDCS.

Inclusion Criteria:

• Ages 18 - 40 years
• Right-handed

Exclusion Criteria:

• concurrent medication likely to affect mental performance
• current history of drug or alcohol abuse or dependence
• any psychiatric or neurological disorder, recent head injury, or history of seizure or stroke.