| Abstract: | The present experiments manipulated the modality in which participants communicated object directions (by pointing or verbal labelling) in a learned layout, and the mode in which they were required to rotate (physically or imaginary). The results showed that the pointing modality was strongly influenced by the mode of rotation (Experiment 1). Pointing was faster and more accurate in the physical than in the imaginary rotation. In addition, a different pattern of dimension accessibility was observed: equi-accessibility in physical rotation (front-back = right-left) and standard in imaginary rotation (front-back < right-left). By contrast, the verbal modality was less influenced by the mode of rotation. The same standard pattern of dimension accessibility and similar speed was obtained in physical and imaginary rotation. These results are explained by proposing a first-order embodiment, typical of ordinary pointing, which involves a low-cost sensory-motor updating of object positions and a second-order embodiment, most typical of language, which involves a represented (rather than physical) self and an object-to-frame high-cost updating. |
