The nursing hypothesis: an evolutionary account of emotional modulation of the postauricular reflex.
Psychophysiology
; 49(2): 178-85, 2012 Feb.
Article
em En
| MEDLINE
| ID: mdl-22092017
ABSTRACT
The postauricular reflex (PAR) is anomalous because it seems to be potentiated during positive emotions and inhibited during negative states, unlike eyeblink and other components of the startle reflex. Two evolutionary explanations based on simian facial emotion expressions were tested. Reflexes were elicited while 47 young adult volunteers made lip pursing or grimacing poses and viewed neutral, intimidating, or appetitive photos. The PAR was enhanced during appetitive slides, but only as subjects carried out the lip-pursing maneuver. These results support the nursing hypothesis, which assumes that infant mammals instinctively retract their pinnae while nursing in order to comfortably position the head. Appetitive emotions prime the ear-retraction musculature, even in higher primates whose postauricular muscles are vestigial.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Reflexo
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Aleitamento Materno
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Músculo Esquelético
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Emoções
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Evolução Biológica
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Pavilhão Auricular
Limite:
Adult
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Female
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Humans
Idioma:
En
Ano de publicação:
2012
Tipo de documento:
Article