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Traumatic brain injury (TBI) can lead to long-term cognitive decline, especially when caused by violence. This study highlights the lasting impact of TBI on cognition in older adults.

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Area of Science:

  • Neurology
  • Gerontology
  • Public Health

Background:

  • Traumatic brain injury (TBI) is a known risk factor for cognitive decline, but research is limited to specific populations like military personnel and athletes.
  • Existing studies often use postmortem methods and focus on male populations, limiting generalizability to the broader population, including women.
  • Little research has investigated the long-term cognitive effects of TBI in the general population using non-postmortem methods.

Purpose of the Study:

  • To analyze longitudinal changes in cognition and dementia risk among adults aged 50 and older following a traumatic brain injury (TBI).
  • To examine differences in cognitive outcomes based on sex/gender, TBI cause, and severity in a general population sample.
  • To investigate the long-term impact of TBI on cognitive health in later life.

Main Methods:

  • Utilized data from the Health and Retirement Study, including TBI history and cognitive assessments (immediate/delayed recall, numeracy, orientation).
  • Employed multilevel regression analysis to assess the association between time since TBI, TBI cause (including interpersonal violence), sequelae count, sex/gender, and cognitive outcomes.
  • Controlled for demographic variables such as age, race/ethnicity, education, wealth, veteran status, homelessness, and incarceration history.

Main Results:

  • Years since traumatic brain injury (TBI) were significantly associated with decreased cognitive function (b = -0.05, p = 0.008).
  • TBI resulting from interpersonal violence showed a significant negative association with cognitive performance (b = -0.74, p = 0.004).
  • No statistically significant association was found between sex/gender or the number of TBI sequelae and cognitive function.

Conclusions:

  • Traumatic brain injury (TBI) can have persistent negative effects on cognitive health long after the injury occurs.
  • The cognitive impact of TBI may be exacerbated when the injury is a result of interpersonal violence.
  • Further research is warranted to explore the complex relationship between violence, TBI, and cognitive health in later life.