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  • Nicotine  (3)
  • Semantic activation  (2)
  • Conditional object discriminations  (1)
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  • 1
    ISSN: 1432-2072
    Schlagwort(e): Cigarettes ; Smoking ; Tobacco ; Nicotine ; Cigarette length
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract The stimuli controlling the rate at which people smoke cigarettes have not been clearly defined. On the hypothesis that smoking is basically nicotine-seeking behavior. nicotine available to the subject was experimentally manipulated through controlling cigarette size and nicotine content. In Experiment I, subjects given their own cigarettes in whole, half, quarter, and eighth lengths, increased the number of cigarettes smoked and number of puffs to compensate for reductions in size. Satisfaction was directly related to cigarette length. In Experiment II, subjects given special cigarettes delivering 0.2 or 2.0 mg nicotine/cigarette smoked significantly more of the low than of the high nicotine cigarettes and took significantly more puffs. As in Experiment I, significantly more quarter length than full length cigarettes were smoked, but total number of puffs did not differe. These results support the hypothesis that nicotine controls smoking behavior.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Experimental brain research 74 (1989), S. 187-201 
    ISSN: 1432-1106
    Schlagwort(e): Limbic system ; Spatial learning ; DNMS ; Conditional object discriminations ; Memory
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary In order to compare the role of the fornix (FX) and cingulate cortex (CC) in memory, rats were trained in a series of discriminations using procedures that were the same as those used for monkeys (Murray et al. 1986, 1988). A spatial delayed nonmatching-to-sample (DNMS) discrimination tested recent memory for spatial location in a T maze using interrun intervals (IRI) that varied from 5 s to 15 min. FX and CC lesions produced a substantial impairment in the performance of this task during postoperative testing. Three conditional discriminations (CD) followed. In each one, the rat was presented with two objects, only one of which was correct. The nature of the conditional stimuli changed in each discrimination: the place of the maze in the room; the direction that the rat moved to approach the objects; the side (left or right) to which the rat turned. Control rats learned all three types of conditional discriminations. FX and CC lesions did not impair choice accuracy. In a subsequent repetition of the spatial DNMS procedure, FX and CC lesions again produced a substantial impairment, indicating that the lack of an impairment in the three CDs was not due to recovery of function. These data indicate that the hippocampal system and its connections through the fornix are importantly involved in spatial working memory in both rats and monkeys, and that the CDs do not require this type of memory. The results are discussed in the context of different theories of the brain mechanisms involved in memory.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Psychopharmacology 118 (1995), S. 136-141 
    ISSN: 1432-2072
    Schlagwort(e): Abstinence ; Intrusive thoughts ; Nicotine ; Priming ; Semantic activation ; Perception ; Processing
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract In a group of heavy smokers, overnight abstinence from smoking facilitated the perception of briefly presented smoking words. Subjects in the nicotineabstinent condition accurately identified significantly more smoking-related words than food-related or neutral words. However, a group tested in a non-abstinent condition showed no significant differences in ability to identify the three different word types. Smokers deprived of cigarettes were also significantly better able to categorize smoking words than non-abstinent subjects. These results demonstrate an abstinence-based facilitation of processing smoking-related stimuli at the semantic level, consistent with the hypothesis that smoking-related concepts are activated, or primed, during deprivation from nicotine.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Psychopharmacology 110 (1993), S. 333-336 
    ISSN: 1432-2072
    Schlagwort(e): Abstinence ; Intrusive thoughts ; Nicotine ; Priming ; Semantic activation ; Stroop interference
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Adult, male smokers were randomly assigned to be nicotine abstinent for 12 h (n=10) or to smoke normally for the same period of time (n=10). Performance on a modified version of the Stroop (1935) color-naming task, where subjects named the color of ink in which each of a series of words was written, showed that abstinent smokers took significantly longer to color-name words related to cigarette smoking (e.g., Lighter) than to color-name neutral control words (e.g., Pennant). Non-abstinent smokers showed a significant difference in the opposite direction. These results suggest that nicotine abstinence decreases the ability to ignore the meaning of smoking-related information. This finding supports the hypothesis that abstinence produces a content-specific shift in attentional focus. The present pattern of results cannot be explained by a general decrease in cognitive function due to nicotine abstinence.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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