Japanese Journal of Animal Psychology
Online ISSN : 1880-9022
Print ISSN : 0916-8419
ISSN-L : 0916-8419
Volume 46, Issue 2
Displaying 1-6 of 6 articles from this issue
  • Hiroyuki ISO
    1996 Volume 46 Issue 2 Pages 41-60
    Published: December 25, 1996
    Released on J-STAGE: October 13, 2009
    JOURNAL FREE ACCESS
    Rats were trained to run in a running wheel under different schedules of reinforcement and different levels of food deprivation. In Experiment 1, the experimental group was reinforced and maintained with a fixed-ratio 40 or fixed-interval 60 sec schedule. The yoked group was confined to the second wheel and received food pellets at the same time when its master rat was reinforced. The experimental animals learned the wheel-running according to the contingency of reinforcement. The yoked rats ran just after reinforcement. This result suggests that wheel-running of the yoked rats is a schedule-induced behavior. The resistance to extinction was strong and all rats maintained high performance during 5 extinction sessions. In Experiment 2, rats which were less hungry than in Experiment 1, were trained under a fixed-ratio 40 or fixed-interval 60 sec food schedule. They learned wheel-running, and rats under the fixed-interval schedule showed evidence of timing behavior, “scallop”. These results indicated that the wheel-running behavior of rats could be reinforced and maintained by food schedules. However, the high resistance to extinction suggests that there were other sources of reinforcement for the running behavior of rats.
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  • Izumi FURUYA
    1996 Volume 46 Issue 2 Pages 61-67
    Published: December 25, 1996
    Released on J-STAGE: October 13, 2009
    JOURNAL FREE ACCESS
    The near-field visual acuity in three pigeons was measured in apparatus that employed a Hi-Vision Video monitor (HDTV) as a stimulus-display device. The pigeons' visual acuity for the standard NTSC video display has not been examined because of its low picture resolution. The spatial resolution of Hi-Vision video system (1125 lines/display) was higher than that of NTSC system (525 lines/display). Pigeons were trained to discriminate a grating stimulus from a blank stimulus of equivalent luminance. The stimuli were presented on the Hi-Vision display behind the transparent keys. A peck on the grating key was reinforced. The distance from the stimulus to the eye was determined by a method of behavioral fixation. The spatial frequency of grating stimuli was varied in each session according to the performance of discrimination. Thresholds ranged from 3.9 min to 11.7 min. These psychophysical data were approximate to the acuity measured with the photographic projection systems. These results suggest that Hi-Vision video display permits sufficient spatial resolution for measuring the pigeons' near-field visual acuity.
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  • Hiroaki NIKI
    1996 Volume 46 Issue 2 Pages 69-82
    Published: December 25, 1996
    Released on J-STAGE: October 13, 2009
    JOURNAL FREE ACCESS
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  • Nobuo IBUKA
    1996 Volume 46 Issue 2 Pages 83-85
    Published: December 25, 1996
    Released on J-STAGE: October 13, 2009
    JOURNAL FREE ACCESS
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  • Keiichiro TSUJI
    1996 Volume 46 Issue 2 Pages 87-88
    Published: December 25, 1996
    Released on J-STAGE: October 13, 2009
    JOURNAL FREE ACCESS
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  • 1996 Volume 46 Issue 2 Pages 89-124
    Published: December 25, 1996
    Released on J-STAGE: October 13, 2009
    JOURNAL FREE ACCESS
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