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When assuming their species-typical tripodal stance, male Mongolian gerbils (Meriones unguiculatus) use their right forepaw for support more frequently than do females. This experiment determined whether, as N. Geschwind and A. M. Galaburda (1987) have proposed, the direction of such sexually dimorphic lateral asymmetry of forelimb use is affected by perinatal exposure to testosterone (TP). It was found that male gerbils injected with TP when 4 days old were significantly less likely to rest on their right forepaw when in a tripodal stance than were their oil-injected siblings. Female gerbils injected with TP when 6 days old were more likely than oil-injected controls to use their right forepaws for support. The findings demonstrate effects of perinatal exposure to TP on handedness in gerbils and suggest that the relationship between TP exposure and asymmetrical forelimb use is not always as direct as Geschwind and Galaburda's model suggests

Asymmetries. --- Asymmetry. --- Control. --- Direction. --- Experiment. --- Exposure. --- Female. --- Females. --- Gerbil. --- Gerbils. --- Handedness. --- Male mongolian gerbils. --- Male. --- Meriones unguiculatus. --- Meriones-unguiculatus. --- Model. --- Mongolian gerbil. --- Mongolian gerbils. --- Mongolian-gerbil. --- Old. --- Perinatal. --- Testosterone. --- Time. --- Unguiculatus.

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Two experiments were carried out in order to determine the effects of either parietal or temporal lesions on performance in a depth vision task in which gerbils normally use retinal image size (RIS) as a cue to distance. In the first experiment, gerbils were trained to jump to two training targets that differed in size and which were always presented with distinctive local features and in a particular spatial location. After lesions, gerbils were presented with further training trials and sets of probe trials in which they were presented with targets that differed in width from the training targets, and sets of local features and distal cues that either matched or mismatched those presented during training. Shams and temporal animals made predictable over- or underjumps when local feature and distal information matched, and stopped using retinal image size when they did not match. Parietal animals did not use retinal image size either during the match or the mismatch conditions. In a second experiment, gerbils with parietal lesions were shown capable of using retinal image size in a simpler task that did not contain distinguishing local features or distal cues. Taken together, these results suggest that parietal lesions in gerbils disrupt object recognition, when the purpose of the recognition process is to complete a distance estimate for a visuomotor act

Animal. --- Animals. --- Boxes. --- Cues. --- Distal cue. --- Distance. --- Experiment. --- Experiments. --- Gerbil. --- Gerbils. --- Head-direction cells. --- Image size. --- Image. --- Lesion. --- Lesions. --- Meriones-unguiculatus. --- Mongolian gerbil. --- Mongolian-gerbil. --- Motion. --- Object recognition. --- Object. --- Parietal cortex. --- Parietal. --- Performance. --- Posterior parietal cortex. --- Purpose. --- Rat. --- Recognition. --- Size. --- Spatial. --- Task. --- Temporal cortex. --- Time. --- Training. --- Vision. --- Visuomotor behavior.