The role (relationship) of visual and motor imagery in estimating reach

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Title: The role (relationship) of visual and motor imagery in estimating reach
Author: Ammar, Diala Fouad
Abstract: The primary intent of this study was to explore fundamental questions about the role and relationship between motor (MI ) and visual (VI ) imagery within the context of estimating reach . Experiment 1 examined and compared VI and MI tasks under matched environmental conditions with the intent to explore the distinction and cooperation of the visual and motor systems in representing actions . The design of this experiment included an interference paradigm modified from Stevens (2005 ) in which six blocks of trials (conditions ) were used : MI , VI , MI with visual interference , MI with motor interference , VI with motor interference , and VI with visual interference . Results indicated that MI was significantly more accurate than VI in regard to total error , distribution of error and mean bias (p <= .05 ) . Significant increases in the number of errors and estimation bias were found when the modalities for the imagined task and the interference task were matched . The data showed that motor tasks interfered with the ability to MI , whereas visual tasks interfered with the ability to VI . Experiment 2 included a response -delay paradigm modified from Bradshaw and Watt (2002 ) in which eight blocks of trials were used : MI and VI conditions with no -delay and delays of 1 - , 2 - and 4 s . Overall , this experiment demonstrated that response -delay influenced accuracy of the MI (visuomotor ) task , but not the VI (perceptual ) task . That is , after a 4s delay , error in MI increased significantly . Interestingly , these results may indicate a crucial temporal constraint for the representation of distance , isolated in the visuomotor system . In view of both experiments , the findings are consistent with the notion of a distinction between vision for perception (VI ) and vision for action (MI ) as advanced by Goodale , Westwood & Milner (2004 ) . In conclusion , VI seems to delineate relevant spatial parameters within the environment and then transfer the information to MI . At this point , information is computed in terms of biomechanical possibilities for a certain movement . In summary , just as perception and action are firmly linked , so too are MI and VI .
URI: http : / /hdl .handle .net /1969 .1 /5992
Date: 2007-09-17


The role (relationship) of visual and motor imagery in estimating reach. Available electronically from http : / /hdl .handle .net /1969 .1 /5992 .

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