Disrupted Association Between Empathy and Brain Structure in Attention-Deficit/Hyperactivity Disorder

Area of Science:

• Neuroscience
• Developmental Psychology
• Psychiatry

Background:

• Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder impacting executive functions.
• Empathy, the ability to understand and share others' feelings, is crucial for social interaction.
• Previous research suggests potential links between ADHD and empathic deficits, but brain structure correlates remain underexplored.

Purpose of the Study:

• To examine the relationship between brain structure and empathy in early adolescents diagnosed with ADHD.
• To compare brain structural differences and empathy levels between adolescents with ADHD and healthy controls.

Main Methods:

• Utilized 3T MRI to acquire T1-weighted scans from 19 early adolescents with ADHD and 20 healthy controls.
• Assessed empathy using the Interpersonal Reactivity Index and Empathy Quotient.
• Analyzed cortical thickness and subcortical volumes using FreeSurfer software.

Main Results:

• Adolescents with ADHD exhibited deficits in cognitive empathy and perspective-taking.
• A brain region associated with emotional empathy (left posterior insula, supramarginal, and transverse temporal cortices) was significantly smaller in the ADHD group.
• The left nucleus accumbens volume was larger in the ADHD group.
• In controls, specific brain regions (left superior temporal, lingual cortices, right amygdala) showed positive associations with different empathy facets.
• No significant correlations between brain structure and empathy were found in the ADHD group.

Conclusions:

• Early adolescents with ADHD demonstrate reduced emotional empathy-related cortical volume and impaired cognitive empathy.
• Unlike healthy controls, individuals with ADHD did not exhibit significant correlations between brain structure and empathy.
• These findings suggest distinct neural underpinnings of empathy in ADHD, highlighting potential targets for intervention.