Cerebellar contribution to emotional body language perception: a TMS study

Area of Science:

• Neuroscience
• Cognitive Psychology
• Affective Science

Background:

• The cerebellum's role in emotional processing is established for facial expressions.
• Its involvement in processing emotions from body postures remains unclear.
• Differential cerebellar recruitment for positive versus negative emotions is unknown.

Purpose of the Study:

• To investigate the cerebellum's role in processing emotions conveyed by body postures.
• To determine if cerebellar function differs for positive and negative emotional stimuli.
• To explore the effects of transcranial magnetic stimulation (TMS) on emotional body posture discrimination.

Main Methods:

• Healthy participants discriminated emotional body postures (Experiment 1: happiness vs. anger; Experiment 2: anger vs. sadness; happiness vs. surprise).
• Online transcranial magnetic stimulation (TMS) was applied over the posterior left cerebellum and control sites (visual cortex, vertex).
• Behavioral performance in discriminating emotional body postures was assessed during TMS.

Main Results:

• Cerebellar TMS significantly impacted the discrimination of emotional body postures.
• This effect was specific to trials involving negatively valenced emotions (e.g., anger).
• No significant effects were observed for positive emotions or when stimulating control sites.

Conclusions:

• The posterior left cerebellum is involved in processing emotional information from body postures and gestures.
• Cerebellar function in emotion processing may be valence-dependent, with a stronger role for negative emotions.
• Non-invasive cerebellar stimulation shows potential for treating affective deficits.