LearningIs neuronal encoding of subject–object distance dependent on learning?Nicol, Alister U.1,3; Brown, Malcolm W.2; Horn, Gabriel1Author Information 1Sub-department of Animal Behaviour, Department of Zoology, Cambridge University, Madingley, Cambridge CB3 8AA, UK 2Department of Anatomy, School of Medical Sciences, Bristol University, University Walk, Bristol BS8 1TD, UK 3Corresponding Author: Alister U. Nicol ACKNOWLEDGEMENTS: We are very grateful to Dr Scarlett B. Pinnock for technical assistance and to the Biotechnology and Biological Sciences Research Council for financial support. Received 10 February 1999; accepted 31 March 1999 NeuroReport: June 3rd, 1999 - Volume 10 - Issue 8 - p 1671-1675 Buy Abstract RECORDINGS were made in the intermediate and medial part of the hyperstriatum ventrale of behaving domestic chicks which had been imprinted (trained) by being exposed to a training stimulus. Neurons were tested for responsiveness to the training stimulus and to an alternative stimulus at each of three distances (d = 0.5 m, 1 m, 2 m) from the chick. For responses to the training stimulus 24/78 (31%) responsive neurons were d-sensitive, i.e. responses changed with distance. For responses to the alternative stimulus, a similar proportion of neurons was d-sensitive (16/57, 28%). Six d-invariant neurons responded similarly at each distance: four to the training and two to the alternative stimulus. Thus no effect of learning on d-sensitive or d-invariant neuronal responsiveness was found. © 1999 Lippincott Williams & Wilkins, Inc.