Japanese Journal of Animal Psychology
Online ISSN : 1880-9022
Print ISSN : 0916-8419
ISSN-L : 0916-8419
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Volume 44, Issue 1-2
Displaying 1-4 of 4 articles from this issue
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  • Diazepam Attenuates Scream Escape/avoidance Behavior in Rats
    KENJIRO AOYAMA, HIROSHIGE OKAICHI
    1995 Volume 44 Issue 1-2 Pages 1-7
    Published: March 25, 1995
    Released on J-STAGE: October 13, 2009
    DOIhttps://doi.org/10.2502/janip.44.1
    JOURNAL FREE ACCESS
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    Our concern is to investigate why a rat's scream can function as a negative reinforcer. To examine this issue, we focused on a rat's anxiety induced by another rat's scream. Rats were assigned to the scream group (n = 6), pure-tone group (n =6), and intense-tone group (n = 6). Each rat was placed in a shuttle-box (Fig. 1) for 10 minutes. While staying in one compartment, auditory stimuli were presented from the speakers placed on both ends of the shuttle-box, but no auditory stimuli were presented while a rat stays in another compartment. In the saline condition (1ml/kg), rats avoided being exposed to scream stimuli (65dB) and intense-tone stimuli (90dB), but did not avoid pure-tone stimuli (65dB). In the diazepam condition (2mg/1ml/kg), rats avoided being exposed to intense-tone stimuli, but did not avoid scream stimuli (Fig. 3). Thus, administration of the anti-anxiety drug selectively attenuated the scream avoidance behavior. These results suggest that the function of a rat's scream as a negative reinforcer is mediated by anxiety.
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  • Blocking of Stimulus-reinforcer Association in Rats That Have Learned Response-reinforcer Association
    MASATO UCHIDA, IWAO ISHII
    1995 Volume 44 Issue 1-2 Pages 9-19
    Published: March 25, 1995
    Released on J-STAGE: October 13, 2009
    DOIhttps://doi.org/10.2502/janip.44.9
    JOURNAL FREE ACCESS
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    Eighteen rats were divided into 3 groups (B, C, Y) to test the blocking effect of prior experience of response-reinforcer associative learning on stimulus-reinforcer associative learning. First, group B was trained to press the lever for unsignaled reinforcer on a CRF schedule. Groups C and Y didn't experience the lever pressing. Next, groups B and C received signaled reinforcer contingent to their CRF lever pressings. Group Y received the signaled reinforcer independently of their behaviors with no lever existed. Finally, all groups were tested by presenting the signal alone independently of their behaviors with the lever removed. Group B showed significantly fewest approaches to the feeder station respondently to the signal presentations. The formation of stimulus-reinforcer association in group B is thought as having been blocked by prior formation of response-reinforcer association.
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  • The Roles of Environmental Cues in Food-searching Behavior in Fimbria-fornix-lesioned Rats
    TOSHIRO SAKAMOTO, HIROSHIGE OKAICHI
    1995 Volume 44 Issue 1-2 Pages 21-29
    Published: March 25, 1995
    Released on J-STAGE: October 13, 2009
    DOIhttps://doi.org/10.2502/janip.44.21
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1995 Volume 44 Issue 1-2 Pages 35-73
    Published: March 25, 1995
    Released on J-STAGE: October 13, 2009
    DOIhttps://doi.org/10.2502/janip.44.35
    JOURNAL FREE ACCESS
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