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Brain imaging technologies provide critical insights into both the structure and function of the human brain, enabling medical professionals and researchers to diagnose, study, and treat neurological disorders or psychiatric disorders more effectively.
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Area of Science:

  • Neuroscience
  • Gerontology
  • Radiology

Background:

  • Falls are a significant issue for older adults, particularly those with cognitive impairments affecting motor control.
  • The specific brain regions impacted in individuals who fall are not well understood.
  • Understanding these brain changes is crucial for developing targeted interventions.

Purpose of the Study:

  • To investigate the correlation between a history of falls and focal brain volume reductions in older adults.
  • To identify specific brain subvolumes associated with fall history in an aging population.
  • To explore potential neuroanatomical underpinnings of falls in individuals with varying cognitive statuses.

Main Methods:

  • A cross-sectional analysis of 208 participants from the MERE study (mean age 71.9 years) was conducted.
  • Participants underwent 1.5-Tesla MRI scans, and their history of falls in the preceding year was recorded.
  • Statistical Parametric Mapping was used for automated segmentation of cortical gray and white matter subvolumes, with adjustments for age, gender, medication, cognitive status, and total intracranial volume.

Main Results:

  • Twenty-eight percent of participants reported a history of falls.
  • Fallers were older, more likely to use psychoactive drugs, and had higher rates of dementia compared to non-fallers.
  • Adjusted analyses revealed that fallers had significantly larger gray matter subvolumes in the striatum, primarily the bilateral caudate nucleus, compared to non-fallers. These findings were specific to participants with mild cognitive impairment or dementia.

Conclusions:

  • Older adults with a history of falls exhibit larger subvolumes in the bilateral striatum, notably the caudate nucleus, compared to non-fallers.
  • These observed neuroanatomical differences suggest a potential adaptive brain mechanism in individuals experiencing falls, particularly those with neurocognitive decline.
  • The study highlights the caudate nucleus as a key region potentially involved in the complex interplay between cognition, aging, and fall risk.