Document Detail

The origin of intermittent exhalation (A! Ha! Ha!) peculiar to human laugh.
MedLine Citation:
PMID:  10938997     Owner:  NLM     Status:  MEDLINE    
Since Darwin (1872), the origin of the laugh with an intermittent exhalation "A! Ha! Ha!" which is peculiar to human, has been a great question. The author found out that this laugh is caused by the three sets of emotion. Firstly, light surprise or discovery. The ability to estimate "light" is absolutely important, because the amount of the first exhalation "A!" caused by the stimulation is decided by the amount of "surprise" felt by the subject. The ability to estimate the amount of "surprise" to be "light", makes the partial exhalation "A!". Secondly, consciousness of this harmlessness or delight, and thirdly, the following expectation of some safe circumstances. The author proved this theory by electromyography (EMG), photoplethysmography and galvanic skin reaction (GSR). The similarity between the facial EMG distribution pattern of "the beginning of laugh" and "the light surprise" was proved by electromyography about many facial muscles, with special fine electrode which did not disturb any natural facial expression of the subjects. Plethysmography and GSR proved light sympathetic tension and following relaxation when laughing. The author also suggests relationships between human laugh and human history such as the origin of clothing, language, and use of fire, which are specific in human.
N Sumitsuji
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Electromyography and clinical neurophysiology     Volume:  40     ISSN:  0301-150X     ISO Abbreviation:  Electromyogr Clin Neurophysiol     Publication Date:    2000 Jul-Aug
Date Detail:
Created Date:  2001-01-03     Completed Date:  2001-01-03     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0327533     Medline TA:  Electromyogr Clin Neurophysiol     Country:  BELGIUM    
Other Details:
Languages:  eng     Pagination:  305-9     Citation Subset:  IM    
Sumitsuji Institute of General Human Science (SIGHS), Hyougo Pref., Japan.
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MeSH Terms
Arousal / physiology
Emotions / physiology
Facial Expression
Facial Muscles / physiology*
Galvanic Skin Response / physiology
Laughter / physiology*
Pulmonary Ventilation / physiology

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