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  • 1
    Electronic Resource
    Electronic Resource
    Tryptophan depletion and aggressive responding in healthy males (1996)
    Springer
    Psychopharmacology 126 (1996), S. 97-103 
    Details
    ISSN: 1432-2072
    Keywords: Serotonin ; Tryptophan ; Aggression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In order to study the effect of decreasing plasma tryptophan levels on aggressive responding in a controlled laboratory setting, we administered two doses (25 g and 100 g) of a tryptophan-free amino acid mixture to ten healthy male subjects after 24 h of a low tryptophan diet. Subjects were screened for current or past psychiatric, or non-psychiatric medical illness. Aggressive responding on a free-operant laboratory measure of aggression (the Point Subtraction Aggression Paradigm) and plasma tryptophan levels were measured before and after drinking the amino acid mixture. There was a significant increase in aggressive responding 5 h after the 100 g mixture and a significant increase in aggressive responding 6 h after the 25 g mixture compared to a baseline day when no drink was administered. There was also a significant decrease in plasma tryptophan at 5 hours after ingestion compared to baseline for both doses of amino acid mixture. This study supports the hypothesis that tryptophan depletion increases aggressive responding in healthy males in a laboratory setting; probably by decreasing brain serotonin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02246343
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Chimpanzees' (Pan troglodytes) choice of prey among termites (macrotermitinae) in western Tanzania (1985)
    Springer
    Primates 26 (1985), S. 375-389 
    Details
    ISSN: 0032-8332
    Keywords: Chimpanzee ; Pan troglodytes ; Diet ; Prey choice ; Termite
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This study examines factors affecting chimpanzees' preying on termites, especially their choice of prey species. Regular surveys of a large sample of termite-mounds in the Mahale Mountains, Tanzania, confirmed that chimpanzees of B Group obtainedMacrotermes, which were relatively uncommon, by the use of fishing-tools, but ignored the much more abundantOdontotermes. This preference appeared to reflectMacrotermes' more extended swarming period, greater accessibility, larger size, and less noxious taste than the soldiers ofOdontotermes. Similar factors probably underly the chimpanzees' choice ofMacrotermes at Gombe, butPseudacanthotermes spiniger are also common there, and their absence from the diet is less easily explained. In contrast, the chimpanzees of K Group at Mahale prey mainly onP. spiniger;Macrotermes are apparently absent, andP. spiniger appear to be more abundant, accessible, and palatable than the alternativeOdontotermes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02382454
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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