[terms…..hippocampus = area of the brain largely responsible for memory]
[terms…..hippocampal volume loss = loss of brain cells in the hippocampus]
[terms…..hippocampal volume loss is also called dementia, Alzheimer’s dementia, etc]

“Low socioeconomic position has been linked to an increased risk of dementia and cognitive decline…..This study examines the relationships between indicators of life-course socioeconomic position with both hippocampal volume and hippocampal volume loss in a population-based cohort of 1,328 older adults aged 65 to 80 years.”

“…..associations of socioeconomic position with baseline hippocampal volume and the annual rate of hippocampal volume atrophy….”
“Participants with lower midlife socioeconomic position had smaller hippocampal volume and faster hippocampal atrophy than participants with higher midlife socioeconomic position.”

“Childhood and early adulthood socioeconomic positions were not related to hippocampal measures.”

“The accumulation-of-risk and the social mobility models revealed that the accumulation of socioeconomic disadvantage and declining socioeconomic trajectories were related to faster hippocampal atrophy.”

“In this cohort of older adults, lower socioprofessional attainment in midlife and disadvantageous life-course socioeconomic position were associated with faster hippocampal atrophy, a cerebral change linked to cognitive disorders. Results support the hypothesized links between socioenvironmental exposures related to stress and/or cognitive enrichment and brain/cognitive reserve capacities.”

M. Elbejjani, et al
Life-Course Socioeconomic Position and Hippocampal Atrophy in a Prospective Cohort of Older Adults
Psychosomatic Medicine — Volume 79 #1 — January 2017 — page 14