Long-Term Lithium Treatment and Sensory Processing Sensitivity in Bipolar Disorder Patients

Area of Science:

• Psychiatry
• Neuroscience
• Psychology

Background:

• Sensory processing sensitivity (SPS) is an innate temperament characterized by ease of excitation (EOE), low sensory threshold (LST), and aesthetic sensitivity (AES).
• Research on SPS in bipolar disorder (BD) and the impact of treatment on these traits is lacking.
• Temperament, personality, and BD course are complexly interrelated, influencing treatment efficacy.

Purpose of the Study:

• To investigate the relationship between pharmacological treatment and sensory processing sensitivity in bipolar disorder patients.
• To explore the effect of long-term lithium treatment on SPS traits in BD.
• To examine if SPS traits predict lithium treatment response.

Main Methods:

• A study group of 35 BD patients (20 BD I, 15 BD II) was analyzed.
• Twenty patients received lithium treatment (16±13 years), and fifteen received other mood stabilizers (14±4 years).
• The Highly Sensitive Person Scale (HSPS) assessed SPS traits (EOE, LST, AES); the Alda Scale evaluated lithium treatment quality.

Main Results:

• Lithium-treated patients showed significantly lower HSPS total scores and EOE compared to those on other mood stabilizers (p=0.009 and p=0.002, respectively).
• Aesthetic sensitivity (AES) and low sensory threshold (LST) scores were similar between groups, though statistical power was limited.
• A negative correlation was found between LST scores and Alda Scale scores (r = -0.484; p=0.031).

Conclusions:

• Longitudinal lithium treatment may decrease overall SPS, especially "ease of excitation," in bipolar disorder patients.
• Lower SPS traits might be a factor contributing to a good response to lithium.
• Lithium treatment may not affect aesthetic sensitivity, a trait linked to creativity.
• "Low sensory threshold" could be a negative predictor for lithium treatment outcomes.