Moderate alcohol consumption was also linked with a larger volume in the hippocampus, a brain region critical for episodic memory. The relationship between light alcohol consumption and episodic memory goes away if hippocampal volume is factored in, providing new evidence that hippocampal functioning is the critical factor in these improvements. These findings were detailed in the American Journal of Alzheimer's Disease and Other Dementias.
University of Texas Medical Branch at Galveston. "If you're over 60, drink up: Alcohol associated with better memory." ScienceDaily. ScienceDaily, 23 October 2014.