Author: Yutaka Kato1,2, Yuichi Takei2, Satoshi Umeda3, Masaru Mimura4, Masato Fukuda2
Affiliation: <sup>1</sup> Tsutsuji Mental Hospital, Gunma, Japan. <sup>2</sup> Department of Psychiatry and Neuroscience, Gunma University Graduate School of Medicine, Maebashi, Japan. <sup>3</sup> Department of Psychology, Keio University, Tokyo, Japan. <sup>4</sup> Department of Neuropsychiatry, Keio University School of Medicine, Tokyo, Japan.
Conference/Journal: Front Psychiatry
Date published: 2020 Jul 22
Other: Volume ID: 11 , Pages: 683 , Special Notes: doi: 10.3389/fpsyt.2020.00683. , Word Count: 273
The majority of the models of emotional processing attribute subjective emotional feelings to physiological changes in the internal milieu, which are sensed by the interoceptive system. These physiological reactions evoked by emotional phenomena occur via the autonomic nervous system, and give rise to alterations in body-mind interactions that are characterized by heartbeat evoked magnetic fields (HEFs) involving brain regions associated with emotional perception. The current study used magnetoencephalography (MEG) to examine regional cortical activity and connectivity changes in HEFs provoked by the emotion of disgust. MEG results from 39 healthy subjects (22 female) revealed that passively listening to sounds of disgust elicited right insular cortical activity and enhancement of cortical connectivity between the right anterior ventral insular cortex and left ventromedial prefrontal cortex, demonstrated by phase lag indexes in the beta frequency range. Furthermore, inter-trial coherence significantly increased at 19 Hz and 23 Hz, and decreased at 14 Hz, which highlights the involvement of low beta oscillations in emotional processing. As these results were based on spontaneously triggered bioelectrical signals, more indigenous and induced signals were extracted with a block designed experiment. The insular cortices play an important role in emotional regulation and perception as the main cortical target for signals with interoceptive information, providing direct substrates of emotional feelings. The current results provide a novel insight into frequency properties of emotional processing, and suggest that emotional arousal evoked by listening to sounds of disgust partially impact the autonomic nervous system, altering HEFs via connectivity changes in the right anterior ventral insular cortex and left ventromedial prefrontal cortex.
Keywords: MEG (magnetoencephalography); cortical connectivity; emotion; heartbeat evoked magnetic fields; insular cortices; insula; oscillation; interoception.
PMID: 32792994 PMCID: PMC7387694 DOI: 10.3389/fpsyt.2020.00683