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Updated: Jul 14, 2026

Environmental Modulations of the Number of Midbrain Dopamine Neurons in Adult Mice
Published on: January 20, 2015
Environmental enrichment for the captive spectacled bear (Tremarctos ornatus)
Michael J Renner1, Jennifer Plebani Lussier
1Department of Psychology, West Chester University, West Chester, PA 19838, USA. mrenner@wcupa.edu
Abstract:
As part a series of investigations of environmental enrichment methods for zoo animals, two spectacled bears (Tremarctos ornatus) were observed for 40 h, documenting use of cage space and behaviors, using a detailed ethogram. Baseline data showed concentration of activity into limited areas of the enclosure and expression of a relatively restricted subset of the species' behavioral repertoire. Introduction of a climbing structure resulted in increased behavioral diversity, both in the use of the enclosure's physical space and the behaviors displayed in various parts of the enclosure.

