TPH2 gene variation and conflict processing in a cognitive and an emotional Stroop task

Area of Science:

• Neuroscience
• Behavioral Genetics
• Psychology

Background:

• The tryptophan-hydroxylase 2 gene (TPH2) promoter polymorphism (-703 G/T) is linked to executive functions.
• Previous research indicates a connection between TPH2 and cognitive control.

Purpose of the Study:

• To investigate if the TPH2 -703 G/T polymorphism affects emotional processing alongside cognitive control.
• To determine the scope of the TPH2 polymorphism's influence on executive functions.

Main Methods:

• A sample of 89 student participants was recruited.
• Cognitive and emotional Stroop paradigms were employed to assess conflict processing.
• Executive control was measured through performance on cognitive and affective conflict tasks.

Main Results:

• The TPH2 -703 G/T polymorphism significantly influenced executive control in both cognitive and emotional tasks.
• Homozygous carriers of the T allele exhibited delayed responses in low-conflict situations.
• These findings suggest potential dysregulation in higher-order executive control mechanisms.

Conclusions:

• The TPH2 -703 G/T polymorphism affects executive control across both cognitive and emotional domains.
• Results support the role of serotonin in integrating cognitive and emotional processing.
• This study provides further behavioral evidence for the TPH2 gene's influence on cognition-emotion interactions.