Characteristics of Haptic Peripersonal Spatial Representation of Object Relations

Haptic perception of space is known to show characteristics that are different to actual space. The current study extends on this line of research, investigating whether systematic deviations are also observed in the formation of haptic spatial representations of object-to-object relations. We conducted a haptic spatial reproduction task analogous to the parallelity task with spatial layouts. Three magnets were positioned to form corners of an isosceles triangle and the task of the participant was to reproduce the right angle corner. Weobserved systematic deviations in the reproduction of the right angle triangle. The systematic deviations were not observed when the task was conducted on the mid-sagittal plane. Furthermore, the magnitude of the deviation was decreased when non-informative vision was introduced. These results suggest that there is a deformation in spatial representation of object-to-object relations formed using haptics. However, as no systematic deviation was observed when the task was conducted on the mid-saggital plane, we suggest that the perception of object-to-object relations use a different egocentric reference frame to the perception of orientation

Characteristics of Haptic Peripersonal Spatial Representation of Object Relations.

Haptic perception of space is known to show characteristics that are different to actual space. The current study extends on this line of research, investigating whether systematic deviations are also observed in the formation of haptic spatial representations of object-to-object relations. We conducted a haptic spatial reproduction task analogous to the parallelity task with spatial layouts. Three magnets were positioned to form corners of an isosceles triangle and the task of the participant was to reproduce the right angle corner. Weobserved systematic deviations in the reproduction of the right angle triangle. The systematic deviations were not observed when the task was conducted on the mid-sagittal plane. Furthermore, the magnitude of the deviation was decreased when non-informative vision was introduced. These results suggest that there is a deformation in spatial representation of object-to-object relations formed using haptics. However, as no systematic deviation was observed when the task was conducted on the mid-saggital plane, we suggest that the perception of object-to-object relations use a different egocentric reference frame to the perception of orientation

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科学研究費助成事業 研究成果報告書：挑戦的萌芽研究2014-2016課題番号 : 2659017

An example of the positive directions for each axis in each condition from a top view (rightward rotation).

<p>An example of the positive directions for each axis in each condition from a top view (rightward rotation).</p

Absolute deviations of the reproduced magnet for all three experiments (cm).

<p>Absolute deviations of the reproduced magnet for all three experiments (cm).</p

A schematic diagram of the 8 layouts used in the experiment.

<p>For each layout, the right angle corner was the corner which the participant reproduced.</p

A schematic diagram of the experimental setup for the right handed group.

<p>The rectangle represents the table. The white circles depict possible places where magnets could be located. Three out of the eight positions were used to make an isosceles triangle. Participants wore eye masks throughout the experiment.</p

The frequency of mean trials reproduced in the four areas.

<p>The frequency of mean trials reproduced in the four areas.</p