Abstract
Side preferences were tested in Syrian hamsters (Mesocricetus auratus) by placing them on an elevated centerboard which divided a rectangular arena in two equal compartments. When descending from the centerboard all animals turned more often right (79%) than left (21%). After small electrolytic lesions of the left caudate nucleus the side preference was reversed: 31% to the right and 69% to the left. Combined lesions of the left caudate nucleus and left sensorimotor cortex showed similar results; lesions of the left cortex alone had only minor effects. These observations support the hypothesis [28] that side preferences depend on asymmetries of the nigrostriatal system.
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