From paintings and photographs to coins and credit cards, we are constantly surrounded by symbolic artifacts. The mental representation of symbols -- objects that arbitrarily represent other objects - ...

The authors provided different forms of environmental enrichment to six old laboratory male tufted capuchin monkeys (Cebus apella) and studied the behavior of the monkeys during a baseline period and ...

Our laboratory, a short time after the introduction of woodchip, became infested with domestic mice. ... We decided to adequate the original idea changing woodchip with argilla espansa ... a material ...