BDNF and memory impairment: The BDNF Val66Met SNP reduces the expression and the activity‐dependent release of BDNF and has been correlated in humans with a smaller hippocampal volume, memory impairments, increased predisposition to develop neuropsychiatric and neurodegenerative disorders, and altered vulnerability to stress (Chen et al., 2006; Egan et al., 2003; Hosang et al., 2014).