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Author Edgar, G.K.; Smith, A.T. url  doi
openurl 
  Title Hemifield differences in perceived spatial frequency Type Journal Article
  Year 1990 Publication Perception Abbreviated Journal  
  Volume 19 Issue 6 Pages 759-766  
  Keywords  
  Abstract Measurements of the perceived spatial frequency of stationary sinewave gratings were made with the gratings presented at the same eccentricity in the left, right, upper, and lower visual hemifields. Ten subjects performed the task binocularly with spatial frequencies of 1, 2, and 4 cycles deg-1. Two of these subjects also performed the task monocularly at 2 cycles deg-1. In the majority of cases, the spatial frequency of stimuli presented in the left and lower visual hemifields was overestimated relative to stimuli presented in the right and upper visual hemifields. The results were similar for all spatial frequencies tested, and the direction of the asymmetry was the same whether viewing was with the left eye, right eye or binocular, suggesting that the differences in perceived spatial frequency are not retinal in origin.  
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  Publisher Pion Ltd Place of Publication Editor (up)  
  Language Summary Language Original Title  
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  Area Expedition Conference  
  Notes Approved no  
  Call Number Equine Behaviour @ team @ Serial 5374  
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Author McGhee, J.R.; Mestecky, J. openurl 
  Title In defence of mucosal surfaces. Development of novel vaccines for IgA responses protective at the portals of entry of microbial pathogens. Type Journal Article
  Year 1990 Publication Abbreviated Journal Infect. Dis. Clin. North Am.  
  Volume 4 Issue 2 Pages 315-341  
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  Publisher Place of Publication Editor (up)  
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  Area Expedition Conference  
  Notes Approved no  
  Call Number Equine Behaviour @ team @ Serial 5999  
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Author Smith, S.F.; Appleby, M.C.; Hughes, B.O. url  doi
openurl 
  Title Problem solving by domestic hens: opening doors to reach nest sites Type Journal Article
  Year 1990 Publication Applied Animal Behaviour Science Abbreviated Journal Appl. Anim. Behav. Sci.  
  Volume 28 Issue 3 Pages 287-292  
  Keywords  
  Abstract In a trial of cage designs for laying hens, eggs were discovered in dust baths where access was restricted by a closed door during the normal laying period (08:00-13:00 h). Observations showed that the hens in these dust bath treatments had developed methods of opening the doors in order to lay in the baths. Three different methods of opening were observed. An average time of 34.4 min was spent attempting to open the doors before access was finally achieved. This implies a strong nesting motivation in these hens. The proportion of eggs laid in the dust baths increased (with occasional fluctuations) over a 24-week period. Door opening is likely to have initially developed in one individual in each cage through a trial and error basis, and then have been learned by cage mates through imitation. The speed and efficiency of door opening was not found to increase with experience or time.  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0168-1591 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number Equine Behaviour @ team @ Serial 6164  
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Author Petherick, J.C.; Rutter, S.M. url  doi
openurl 
  Title Quantifying motivation using a computer-controlled push-door Type Journal Article
  Year 1990 Publication Applied Animal Behaviour Science Abbreviated Journal Appl. Anim. Behav. Sci.  
  Volume 27 Issue 1 Pages 159-167  
  Keywords  
  Abstract A computer-controlled push-door system was designed and tested as a method for measuring motivation. Eleven domestic hens were trained to use the push-door to gain access to food. They were deprived of food for 12 h or 43 h on 12 occasions and the push-door was used to measure the amount of “work” (measured as force × time) that they performed to gain access to a food reward. When deprived of food for 12 h the hens took significantly longer (P<0.01) to reach the required threshold of work, than when deprived for 43 h. This difference arose from the amount of time that the hens spent not pushing at the door. The problems encountered with this system and such an approach to measuring motivation are discussed.  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0168-1591 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number Equine Behaviour @ team @ Serial 6165  
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Author Byrne, R.W.; Whiten, A. openurl 
  Title Tactical deception in primates: the 1990 database Type Book Whole
  Year 1990 Publication Primate Reports Abbreviated Journal Primate Rep.  
  Volume 27 Issue Pages 1-101  
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  Publisher German Primate Center Place of Publication Editor (up)  
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  Notes Approved no  
  Call Number Equine Behaviour @ team @ Serial 6172  
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Author Tomasello, M. openurl 
  Title Cultural transmission in the tool use and communicatory signalling of chimpanzees? Type Book Chapter
  Year 1990 Publication Language and Intelligence in Monkeys and Apes. Abbreviated Journal  
  Volume Issue Pages 274-311  
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  Corporate Author Thesis  
  Publisher Cambridge University Press Place of Publication Cambridge Editor (up) Parker,S.T.;Gibson,K.R.  
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  Notes Approved no  
  Call Number Equine Behaviour @ team @ Serial 5267  
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Author Klingel, H. openurl 
  Title Kalameili – future home of the Przewalski horse? Type Book Chapter
  Year 1990 Publication Proceedings of the 5th International Symposium on the Preservation of the Przewalski Horse, Leipzig Abbreviated Journal  
  Volume Issue Pages 221-224  
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  Publisher Zoolog Garten Place of Publication Leipzig Editor (up) Seifert, S.  
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  Notes from Professor Hans Klingels Equine Reference List Approved yes  
  Call Number Serial 1323  
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