Abstract
Prisms shifting the visual input sideways produce a mismatch between the visual versus felt position of one’s hand. Prism adaptation eliminates this mismatch, realigning hand proprioception with visual input. Whether this realignment concerns exclusively the visuo-(hand)motor system or it generalizes to acoustic inputs is controversial. We here show that there is indeed a slight influence of visual adaptation on the perceived direction of acoustic sources. However, this shift in perceived auditory direction can be fully explained by a subconscious head rotation during prism exposure and by changes in arm proprioception. Hence, prism adaptation does only indirectly generalize to auditory space perception.
Highlights
Interactions with the environment, such as grasping a remote, opening a window, or playing tennis (Baraduc & Wolpert, 2002; Kitazawa, Kohno, & Uka, 1995), rely on highly complex sensory-motor coordination (Crawford, Medendorp, & Marotta, 2004)
The present study investigates the influence of horizontally shifting prism glasses on acoustic localization
We found that the direct prism effect is smaller while the change in subconscious head rotation is larger in the light condition, and the influence of head rotation on acoustic localization should be larger in the light
Summary
Interactions with the environment, such as grasping a remote, opening a window, or playing tennis (Baraduc & Wolpert, 2002; Kitazawa, Kohno, & Uka, 1995), rely on highly complex sensory-motor coordination (Crawford, Medendorp, & Marotta, 2004). I-Perception reach toward visual objects (Bedford, 1995; Efstathiou, 1969; Guan & Wade, 2000; Harris, 1963, 1965; Hay & Pick, 1966; Redding, Rossetti, & Wallace, 2005; Redding & Wallace, 2006; Taub & Goldberg, 1973) This discrepancy between the visual input and hand proprioception is perceived and induces prism adaptation, as is the case in other adaptations to altered sensory environments (Welch, 2013; Welch & Cohen, 1991; Zwiers, van Opstal, & Paige, 2003). We do find an effect of prism adaptation on acoustic localization, but this shift is not genuinely of acoustic nature
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