Using an emotional saccade task to characterize executive functioning and emotion processing in attention-deficit...

Area of Science:

• Neuroscience
• Psychiatry
• Cognitive Psychology

Background:

• Attention-deficit hyperactivity disorder (ADHD) and bipolar disorder (BD) share overlapping cognitive and emotional processing deficits, complicating differential diagnosis.
• Executive functioning and emotion processing are critical areas affected in both ADHD and BD, necessitating further characterization.

Purpose of the Study:

• To investigate executive functioning and emotion processing in adult ADHD and BD using an emotional saccade task.
• To compare performance on response inhibition and emotion perception between individuals with ADHD, BD, and healthy controls.

Main Methods:

• Participants (21 controls, 20 ADHD, 20 BD) completed an interleaved pro/antisaccade task using emotional face stimuli.
• The task involved directing saccades toward or away from a visual target, cued by the sex of emotional faces.
• Measures included direction errors, anticipatory errors, and microsaccade rates.

Main Results:

• Both ADHD and BD groups exhibited increased direction and anticipatory errors compared to controls, indicating impaired response inhibition.
• Task-related modulation of microsaccade rates was absent in both patient groups, unlike in controls.
• The ADHD group showed deficits with neutral faces, while the BD group performed worse across all emotional valences.

Conclusions:

• Findings support the involvement of fronto-striatal circuitry in response inhibition deficits common to both ADHD and BD.
• Bipolar disorder appears to exacerbate emotion processing deficits, likely due to dysregulation in limbic circuitry (e.g., anterior cingulate, orbitofrontal cortex).