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Two Neural Networks for Laughter: A Tractography Study.

M Gerbella¹, C Pinardi², G Di Cesare³

¹Department of Medicine and Surgery, University of Parma, Parma 43125, Italy.

Cerebral Cortex (New York, N.Y. : 1991)

|September 24, 2020

Summary

This summary is machine-generated.

This study reveals two distinct brain networks for laughter: one for emotional laughter and another for nonemotional, conversational laughter. White matter tracts like the anterior cingulate bundle and internal capsule support these separate pathways.

Keywords:

connections diffusion tensor imaging laughter circuits mirth social behavior white matter tracts

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Area of Science:

Neuroscience
Neuroanatomy
Motor Control

Background:

Laughter is a complex behavior with both emotional and nonemotional functions.
Understanding the neural basis of distinct laughter types is crucial for neuroscience.

Purpose of the Study:

To investigate if different laughter functions are mediated by distinct neural networks.
To identify the white matter tracts supporting these distinct laughter networks.

Main Methods:

Multifiber tractography was employed using seed regions identified from prior human studies.
Key regions included pregenual anterior cingulate (pACC), ventral temporal pole (TPv), frontal operculum (FO), and ventral striatum/nucleus accumbens (VS/NAcc).
Projections from primary motor cortex (M1) were also analyzed.

Main Results:

Two distinct networks for laughter production were identified.
A network involving pACC, TPv, and VS/NAcc, connected by tracts like the anterior cingulate bundle, supports emotional laughter.
A second network involving FO and M1, connected via the internal capsule, underlies nonemotional and conversational laughter.

Conclusions:

Distinct neural networks and white matter tracts underpin different types of laughter.
The pre-supplementary motor area (pre-SMA) serves as an interaction hub between these networks.