Interactions Between Depression, Autonomic Dysfunction, Inhibitory Control and Reaction Time: Insights From Heart...

Area of Science:

• Neuroscience
• Psychophysiology
• Cardiology

Background:

• Depression is linked to autonomic dysfunction.
• Inhibitory control (IC) and reaction time are crucial cognitive functions.
• Heart rate variability (HRV) reflects autonomic nervous system (ANS) activity.

Purpose of the Study:

• To investigate the relationship between depression, autonomic dysfunction, IC, and reaction time.
• To analyze HRV during a cognitive task in healthy and depressed males.
• To correlate HRV parameters with IC and reaction time.

Main Methods:

• 29 healthy males and 25 depressed males (aged 20-35) participated.
• HRV data were collected during the Conners Continuous Performance Test-II (CCPT-II).
• Analyzed HRV parameters (RR intervals, SDNN, lnLF, lnHF) and correlated them with IC (d') and reaction time.

Main Results:

• Depressed individuals showed significantly lower lnHF.
• Both groups exhibited decreased SDNN and lnLF during CCPT-II.
• Healthy individuals showed correlations between d' and HRV parameters; depressed individuals only showed correlation with RR intervals.

Conclusions:

• Reaction time correlates with ANS function in healthy individuals during later stages of cognitive tasks.
• Depression disrupts the association between ANS function and cognitive performance.
• Depression impairs IC and autonomic regulation, likely due to neural network impairment rather than speed-accuracy trade-offs.