Hippocampal atrophy is associated with subjective memory decline: The PATH Through Life study

Area of Science:

• Neuroscience
• Gerontology
• Cognitive Psychology

Background:

• Subjective memory decline (SMD) is a common concern among aging populations.
• Understanding the neurobiological underpinnings of SMD is crucial for early detection of cognitive impairment.
• The hippocampus plays a vital role in memory formation and is vulnerable to age-related changes.

Purpose of the Study:

• To examine the relationship between hippocampal atrophy and subjective memory decline in cognitively healthy individuals.
• To determine if baseline or follow-up SMD predicts hippocampal volume changes over time.

Main Methods:

• Longitudinal study involving 305 cognitively healthy participants aged 60-64 years.
• Multiple regression analyses were used to assess the association between hippocampal atrophy and SMD over a 4-year period.
• Anxiety and depression symptomatology were controlled for in the analyses.

Main Results:

• Subjective memory decline at baseline did not predict hippocampal atrophy.
• However, subjective memory decline reported at follow-up was significantly associated with greater hippocampal atrophy.
• This association remained significant even after accounting for anxiety and depression.

Conclusions:

• Hippocampal atrophy is associated with incident or persistent subjective memory decline in older adults.
• The findings suggest a biological basis for subjective memory decline, not solely attributable to psychological factors.
• Subjective memory decline warrants inclusion in screening and neuropsychological assessments for early detection of cognitive changes.