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Brian Garrison, Colin Ellard; The connection effect in the disconnect between peripersonal and extrapersonal space. Journal of Vision 2009;9(8):79. doi: 10.1167/9.8.79.
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© ARVO (1962-2015); The Authors (2016-present)
Previous studies suggest that line bisection performance shows a leftward bias when completed in peripersonal (near) space and a rightward bias in extrapersonal (far) space, even in an immersive virtual environment (Gamberini, Seraglia, & Prifits, Neuropsychologia, 2007). Furthermore, extrapersonal space can be remapped as peripersonal space by extending reach through tool use; using a stick for bisecting far lines shows the leftward bias whereas using a laser pointer shows the rightward bias. With a head-mounted display showing a computer-simulated environment, participants bisected lines by controlling a free-floating dot, a free-floating hand, or a hand connected by an arm. Lines appeared on a lectern in front of the seated participants while a real lectern provided tactile feedback to match the visual display. Due to large order effects across blocks for mode of bisection (arm/hand/dot), comparisons were made between participants using the first condition encountered. Peripersonal (90cm away) conditions were blocked and counterbalanced as a within-participants factor. At one point in the experiment, between blocks of trials, a virtual needle appeared. Galvanic skin response measured autonomic reaction to watching the needle poke the hand/dot controlled by participants. As a control, half watched the needle poke a second hand/dot. A partial replication of Gamberini et al. (2008) showed a distinction between the arm and dot conditions with the expected leftward and rightward biases, respectively.
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