Heterosis and learning in the mouse

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The present investigation was concerned with heterosis in learning. Ss were drawn from 3 inbred mouse strains and the 3 hybrid crosses between them with ½ the Ss in each genotype receiving traumatic auditory stimulation during infancy. Adult learning ability was examined by means of repeated trials in a 4-unit alley maze and in a water-escape test. It was predicted that hybrids would be superior to inbred Ss, less affected by infantile trauma and less variable in their performance in both maze and water escape. Findings provided relatively strong confirmation of hybrid water-escape superiority and resistance to infantile trauma, but only partial confirmation of hybrid maze superiority and lower variability in water escape. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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