Affect recognition, empathy, and dysosmia after traumatic brain injury

Area of Science:

• Neuroscience
• Clinical Psychology
• Rehabilitation Medicine

Background:

• Traumatic brain injury (TBI) frequently results in olfactory dysfunction.
• The neural pathways for olfaction overlap with brain regions crucial for emotion processing, such as the orbital frontal cortex.
• This overlap suggests a potential link between smell impairment and deficits in affect recognition and empathy following TBI.

Purpose of the Study:

• To investigate the association between olfactory deficits and impairments in affect recognition and empathy in individuals with TBI.
• To determine if olfactory dysfunction can serve as an indicator for these socio-emotional deficits.

Main Methods:

• A comparative study involving 106 adults with moderate to severe TBI, divided into groups with impaired olfaction (dysosmia) and normal olfaction (normosmia).
• Olfactory function was assessed using the Brief Smell Identification Test.
• Affect recognition (facial and vocal), emotional inference, and empathy were evaluated using standardized tests (DANVA2-AF, DANVA2-AP, EIST, IRI).

Main Results:

• 56% of participants had dysosmia, with many unaware of their deficit.
• Participants with dysosmia demonstrated significantly poorer performance across all measures of affect recognition, emotional inference, and empathy.
• Dysosmia showed high sensitivity in detecting impairments in facial (86.4%) and vocal (67.8%) affect recognition.

Conclusions:

• Olfactory deficits following TBI are significantly associated with impaired affect recognition and reduced empathy.
• Assessing olfactory function may help identify individuals with TBI who require targeted interventions for socio-emotional processing deficits.
• Early identification of these deficits is crucial for timely treatment implementation before patient discharge.