This study seeks to differentiate task-related and resting brain activity patterns captured via functional magnetic resonance imaging (fMRI) and associated with two common Alzheimer's disease (AD) medications, equivalent in acetylcholinesterase inhibition effect (AChEI) but differing with respect to allosteric nicotinic receptor modulation effect. It is the primary aim of this project to gain a better understanding of the brain mechanisms involved in the attentional and executive skills improvements associated with nicotinic receptor modulation in mild AD patients.