To explore the perceptual characteristics of the oral region, 20 young adults were required to trace lingually a groove scored in a plastic disc and report its horizontal or vertical orientation. Performance was significantly better (P < .001) in perceiving orientation around the horizontal plane than around the vertical. An angular deviation of 30° was required before all Ss could detect that the groove was not in the horizontal or vertical plane. No significant difference (P > .05) was found in performance by males and females.
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