Abstract:
:The neurochemical changes underlying human emotions and social behaviour are largely unknown. Here we report on the changes in the levels of two hypothalamic neuropeptides, hypocretin-1 and melanin-concentrating hormone, measured in the human amygdala. We show that hypocretin-1 levels are maximal during positive emotion, social interaction and anger, behaviours that induce cataplexy in human narcoleptics. In contrast, melanin-concentrating hormone levels are minimal during social interaction, but are increased after eating. Both peptides are at minimal levels during periods of postoperative pain despite high levels of arousal. Melanin-concentrating hormone levels increase at sleep onset, consistent with a role in sleep induction, whereas hypocretin-1 levels increase at wake onset, consistent with a role in wake induction. Levels of these two peptides in humans are not simply linked to arousal, but rather to specific emotions and state transitions. Other arousal systems may be similarly emotionally specialized.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Blouin AM,Fried I,Wilson CL,Staba RJ,Behnke EJ,Lam HA,Maidment NT,Karlsson KÆ,Lapierre JL,Siegel JMdoi
10.1038/ncomms2461subject
Has Abstractpub_date
2013-01-01 00:00:00pages
1547issn
2041-1723pii
ncomms2461journal_volume
4pub_type
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