| Records |
| Author |
Zentall, T.R; Hogan, D.E. |
| Title |
Key pecking in pigeons produced by pairing keylight with inaccessible grain |
Type |
Journal Article |
| Year |
1975 |
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Abbreviated Journal |
J Exp Anal Behav |
| Volume |
23 |
Issue |
2 |
Pages |
199-206 |
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| Abstract |
In Experiment I, keylight was paired with inaccessible grain delivery (under two conditions of keylight intensity) to determine if autoshaping would occur in the absence of primary reinforcement. In Experiment II, the procedure was repeated with accessible grain, for comparison. In Experiment III, the procedures were repeated with explicitly unpaired presentations of keylight and either inaccessible or accessible grain. The results indicated that key pecking occurred as quickly in the presence of keylight pairings with inaccessible grain as with accessible grain, though (except for one bird) key pecking was not maintained with inaccessible grain. Furthermore, compared to the dim keylight, the bright keylight greatly suppressed key pecking when paired with inaccessible grain, and reduced the rate of key pecking when paired with accessible grain. Little key pecking occurred in groups exposed to explicitly unpaired presentations of keylight (whether bright or dim) and grain (whether accessible or inaccessible). When the birds in Experiment III were retested with explicitly paired presentations of keylight and grain, little key pecking was observed, suggesting suppressive effects of prior explicitly unpaired presentations. It is suggested that the effects of key-brightness manipulation were produced by the association of grain with cues other than the response key, or by distraction produced by partial illumination of the grain hopper. |
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English |
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0022-5002 |
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PMID:16811840 |
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refbase @ user @ |
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273 |
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| Author |
Douglas Rh, G.O. |
| Title |
Development of the equine fetus and placenta |
Type |
Journal Article |
| Year |
1975 |
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Abbreviated Journal |
J Reprod Fert (Suppl) |
| Volume |
23 |
Issue |
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Pages |
495-498 |
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from Professor Hans Klingels Equine Reference List |
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no |
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1023 |
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| Author |
Eisenmann V, |
| Title |
Nouvelles interpretations des restes d`équides de Nihowan Equus teilhardi Nov.Sp |
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Journal Article |
| Year |
1975 |
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Abbreviated Journal |
Geobios |
| Volume |
8 |
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125-134 |
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from Professor Hans Klingels Equine Reference List |
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no |
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1047 |
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| Author |
FRASER AF et al, |
| Title |
An exploratory ultrasonic study on quntitative foetal kinesis in the horse |
Type |
Journal Article |
| Year |
1975 |
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Abbreviated Journal |
Appl Anim Ethol |
| Volume |
1 |
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Pages |
395-404 |
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from Professor Hans Klingels Equine Reference List |
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no |
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1093 |
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| Author |
Imesh Gd, S.G. |
| Title |
Gross and microscopic observations of ovarian abnormalities from five Burchell's zebra |
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Journal Article |
| Year |
1975 |
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Onderstepoort J vet Res |
| Volume |
42 |
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109-116 |
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from Professor Hans Klingels Equine Reference List |
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no |
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Serial |
1213 |
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| Author |
Klingel H, |
| Title |
Die soziale Organisation der Equiden |
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Journal Article |
| Year |
1975 |
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Verh Dtsch Zool Ges in Karlsruhe |
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71-80 |
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from Professor Hans Klingels Equine Reference List |
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no |
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Serial |
1308 |
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| Author |
Leuthold W, L.B. |
| Title |
Temporal patterns of reproduction in ungulates of Tsavo East National Park Kenya |
Type |
Journal Article |
| Year |
1975 |
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Abbreviated Journal |
E Afr Wildl J |
| Volume |
13 |
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159-170 |
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from Professor Hans Klingels Equine Reference List |
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no |
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Serial |
1345 |
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| Author |
Malcom Jr, L.H. |
| Title |
Notes on wild dogs hunting zebras |
Type |
Journal Article |
| Year |
1975 |
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Mammalia |
| Volume |
39 |
Issue |
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Pages |
231-240 |
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from Professor Hans Klingels Equine Reference List |
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no |
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Serial |
1363 |
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| Author |
Montagu I, |
| Title |
The wild ass of Africa |
Type |
Journal Article |
| Year |
1975 |
Publication |
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Abbreviated Journal |
Wild Life |
| Volume |
17 |
Issue |
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Pages |
400-401 |
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from Professor Hans Klingels Equine Reference List |
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no |
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Serial |
1409 |
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| Author |
Niekerk Van Ch, A.W. |
| Title |
Early embryonic development in the horse |
Type |
Journal Article |
| Year |
1975 |
Publication |
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Abbreviated Journal |
J Reprod Fert Suppl |
| Volume |
23 |
Issue |
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Pages |
495-498 |
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from Professor Hans Klingels Equine Reference List |
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no |
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Serial |
1417 |
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