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5-HTTLPR and anxiety modulate brain-heart covariation
Erik M Mueller1, Gerhard Stemmler, Jürgen Hennig
1Department of Psychology, Philipps-Universität Marburg, Marburg, Germany. erik.mueller@psychol.uni-giessen.de
Psychophysiology
|March 1, 2013
Summary
The serotonin transporter polymorphism 5-HTTLPR influences brain-heart communication. This genetic variation, along with neuroticism/anxiety, impacts how brain and heart activity interact.
Area of Science:
- Neuroscience
- Psychophysiology
- Behavioral Genetics
Background:
- The interplay between brain and heart activity is not well understood at the genetic level.
- Serotonin (5-HT) plays a role in corticovagal neurotransmission, suggesting a potential link to brain-heart interactions.
- Anxiety is associated with serotonin and neurogenic heart period changes, indicating a connection to neuroticism/anxiety (NANX).
Purpose of the Study:
- To investigate if the serotonin transporter polymorphism 5-HTTLPR affects brain-heart covariation.
- To examine the associations between 5-HTTLPR, brain-heart covariation, and neuroticism/anxiety (NANX).
Main Methods:
- 168 participants completed a time-estimation task while electroencephalography (EEG) and heart period (HP) were recorded.
- Brain-heart covariation was assessed using time-lagged correlations between centromedial feedback-evoked single-trial EEG (at 300 ms) and subsequent HP changes.
- Associations with 5-HTTLPR genotype and NANX scores were analyzed.
Main Results:
- EEG-HP correlations were significantly higher in carriers of the 5-HTTLPR long allele.
- Following negative feedback, enhanced EEG-HP correlations and feedback-related negativity amplitudes were independently associated with NANX scores.
- Individual differences in brain-heart covariation were linked to both 5-HTTLPR genotype and NANX.
Conclusions:
- The 5-HTTLPR genotype influences the covariation between brain and heart activity.
- Neuroticism/anxiety (NANX) is independently associated with brain-heart covariation and neural responses to feedback.
- These findings highlight the role of serotonin and psychological factors in modulating brain-heart interactions.
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