Differential effects of endogenous lithium on neurobehavioural functioning: a study on auditory evoked potentials
Christine Norra1, Johanna Feilhauer, Gerhard Andreas Wiesmüller
1Department of Psychiatry, Ruhr-University Bochum, Bochum, Germany. Christine.Norra@rub.de
Psychiatry Research
|May 11, 2010
Summary
Low lithium levels in the body are linked to emotional instability, while higher levels may offer protective effects. This study explored nutritional lithium
Area of Science:
- Nutritional Neuroscience
- Psychopharmacology
- Neurobiology
Background:
- Lithium is naturally present in food and water, with low environmental concentrations linked to mental health issues.
- Therapeutic lithium dosages are used for psychiatric disorders, influencing serotonergic (5-HT) neurotransmission.
- The psychophysiological role of nutritional lithium in the general population remains under-investigated.
Purpose of the Study:
- To investigate the association between endogenous lithium concentrations and emotional liability in healthy individuals.
- To explore the relationship between lithium levels and loudness dependence (LD), an indicator of 5-HT neurotransmission.
- To assess the psychophysiological effects of varying nutritional lithium levels.
Main Methods:
- Recorded auditory evoked potentials in healthy volunteers (N=36) with high (>2.5 microg/l) or low (<1.5 microg/l) serum lithium concentrations.
- Assessed emotional liability using the Brief Symptom Inventory (BSI).
- Correlated lithium serum concentrations with LD and BSI scores.
Main Results:
- Low lithium levels correlated significantly with Somatisation symptoms.
- No significant direct correlation was found between lithium levels and LD.
- LD positively correlated with Paranoid Ideation and negatively with Anxiety; in the high-lithium group, LD inversely correlated with Depression and Psychological Distress.
Conclusions:
- Low endogenous lithium levels are associated with increased emotional liability.
- Higher lithium levels may confer some protective effects on emotional well-being.
- Findings suggest potential neurobehavioral benefits of endogenous lithium, warranting further investigation, especially for LD and high-risk populations.
