"This implies that genetic risk of Alzheimer's disease may exert an effect on the hippocampus very early in life, which may make those individuals more likely to get Alzheimer's disease late in life," said lead researcher Elizabeth Mormino. She is an instructor in neurology at Massachusetts General
Younger adults with various genetic risk factors for Alzheimer's have a smaller hippocampal volume, said Elizabeth Mormino, a researcher at Massachusetts General Hospital and lead author of the study.