Reference frames for coding touch location depend on the task

Pritchett, Lisa M.; Carnevale, Michael; Harris, Laurence R.

doi:10.1007/s00221-012-3231-4

Cited by 34 publications

(32 citation statements)

References 44 publications

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“…For instance, the role of eye and head direction has been systematically investigated in a series of studies on tactile localization demonstrating that relevant body locations can be coded in external space according to several different reference points (Ho and Spence, 2007; Harrar and Harris, 2009; Pritchett and Harris, 2011; Pritchett et al, 2012; Mueller and Fiehler, 2014). When participants were asked to localize the position of a tactile stimulus presented to the participants’ body, the presence of systematic eye-position and head-position related errors revealed that not only the eye but also the head position contributed to the representation of external space (Ho and Spence, 2007; Harrar and Harris, 2009; Pritchett and Harris, 2011; Pritchett et al, 2012). In addition, also the body midline might be used as a reference point to code tactile locations under specific circumstances (Pritchett et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

“…When participants were asked to localize the position of a tactile stimulus presented to the participants’ body, the presence of systematic eye-position and head-position related errors revealed that not only the eye but also the head position contributed to the representation of external space (Ho and Spence, 2007; Harrar and Harris, 2009; Pritchett and Harris, 2011; Pritchett et al, 2012). In addition, also the body midline might be used as a reference point to code tactile locations under specific circumstances (Pritchett et al, 2012). These results suggest the existence of multiple reference points for external representations of body locations.…”

Section: Discussionmentioning

confidence: 99%

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Attention to the body depends on eye-in-orbit position

Gherri¹,

Förster²

2014

Front. Psychol.

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Attentional selectivity in touch is modulated by the position of the body in external space. For instance, during endogenous attention tasks in which tactile stimuli are presented to the hands, the effect of attention is reduced when the hands are placed far apart than when they are close together and when the hands are crossed as compared to when they are placed in their anatomical position. This suggests that both somatotopic and external spatial reference frames coding the hands’ locations contribute to the spatial selection of the relevant hand. Here we investigate whether tactile selection of hands is also modulated by the position of other body parts, not directly involved in tactile perception, such as eye-in-orbit (gaze direction). We asked participants to perform the same sustained tactile attention task while gazing laterally toward an eccentric fixation point (Eccentric gaze) or toward a central fixation point (Central gaze). Event-related potentials recorded in response to tactile non-target stimuli presented to the attended or unattended hand were compared as a function of gaze direction (Eccentric vs. Central conditions). Results revealed that attentional modulations were reduced in the Eccentric gaze condition as compared to the Central gaze condition in the time range of the Nd component (200–260 ms post-stimulus), demonstrating for the first time that the attentional selection of one of the hands is affected by the position of the eye in the orbit. Directing the eyes toward an eccentric position might be sufficient to create a misalignment between external and somatotopic frames of references reducing tactile attention. This suggests that the eye-in-orbit position contributes to the spatial selection of the task relevant body part.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Attention to the body depends on eye-in-orbit position

Gherri¹,

Förster²

2014

Front. Psychol.

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“…For example, visual and external reference frames seem to be weighted more strongly when the task comprises a motor action (Pritchett et al, 2012;Gherri and Forster, 2012;Fiehler, 2014a, 2014b), or when non-informative vision is provided (Newport et al, 2002). Furthermore, remapping effects were larger when a tactile task explicitly required remapping (for example, when the external location of touch was relevant for the response), than when the task was based on anatomical touch location (for example, reporting the stimulated finger, Gallace et al, 2008).…”

Section: Introductionmentioning

confidence: 92%

Flexibly weighted integration of tactile reference frames

2015

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“…The effect appears to be equally affected by either eye or head displacement and is therefore best described as relating to gaze, the sum of eye and head position (Pritchett and Harris, 2011). The perceived location of touch also depends on whether a participant moves their gaze between the presentation of the touch and reporting its perceived location (Pritchett et al, 2012; Mueller and Fiehler, 2014). The perceived location shifts in the same direction as gaze if a gaze change occurs before the report (Harrar and Harris, 2009; Pritchett and Harris, 2011; Harrar et al, 2013), but in the opposite direction if the person does not move before making their report (Ho and Spence, 2007; Pritchett et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…If participants shift gaze before reporting, displacements are in the direction of gaze (C) . Data redrawn from Pritchett et al (2012).…”

Section: Introductionmentioning

confidence: 99%

How our body influences our perception of the world

et al. 2015

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Incorporating the fact that the senses are embodied is necessary for an organism to interpret sensory information. Before a unified perception of the world can be formed, sensory signals must be processed with reference to body representation. The various attributes of the body such as shape, proportion, posture, and movement can be both derived from the various sensory systems and can affect perception of the world (including the body itself). In this review we examine the relationships between sensory and motor information, body representations, and perceptions of the world and the body. We provide several examples of how the body affects perception (including but not limited to body perception). First we show that body orientation effects visual distance perception and object orientation. Also, visual-auditory crossmodal-correspondences depend on the orientation of the body: audio “high” frequencies correspond to a visual “up” defined by both gravity and body coordinates. Next, we show that perceived locations of touch is affected by the orientation of the head and eyes on the body, suggesting a visual component to coding body locations. Additionally, the reference-frame used for coding touch locations seems to depend on whether gaze is static or moved relative to the body during the tactile task. The perceived attributes of the body such as body size, affect tactile perception even at the level of detection thresholds and two-point discrimination. Next, long-range tactile masking provides clues to the posture of the body in a canonical body schema. Finally, ownership of seen body parts depends on the orientation and perspective of the body part in view. Together, all of these findings demonstrate how sensory and motor information, body representations, and perceptions (of the body and the world) are interdependent.

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Reference frames for coding touch location depend on the task

Cited by 34 publications

References 44 publications

Attention to the body depends on eye-in-orbit position

Attention to the body depends on eye-in-orbit position

Flexibly weighted integration of tactile reference frames

How our body influences our perception of the world

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