Effects of lateral head inclination on multimodal spatial orientation judgments in neglect: Evidence for impaired spatial orientation constancy

Funk, Johanna; Finke, Kathrin; Müller, Hermann J.; Utz, Kathrin S.; Kerkhoff, Georg

doi:10.1016/j.neuropsychologia.2010.01.029

Cited by 33 publications

(31 citation statements)

References 53 publications

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“…The first reported findings similar to those in the cat (Sauvan and Peterhans, 1999), but had multiple methodological issues and was contradicted by the second, which found no indication of a gravity-centered representation in V1 (Daddaoua et al, 2014). Consistent with the present results, clinical studies suggest gravity-centered representations arise in parietal cortex (Brandt et al, 1994;Funk et al, 2010;Guardia et al, 2012), an important locus of multisensory processing and reference frame transformations (Buneo et al, 2002;Avillac et al, 2005;Mullette-Gillman et al, 2009;Chang and Snyder, 2010;Seilheimer et al, 2014).…”

supporting

confidence: 86%

“…This reflects that external gravitational signals detected by the vestibular and proprioceptive systems are used to reinterpret egocentrically encoded retinal images in gravitycentered coordinates (De Vrijer et al, 2008). Deficits in the vestibular system or in the ability to combine gravitational and visual signals due to brain injury thus compromise visual stability (Brandt et al, 1994;Funk et al, 2010Funk et al, , 2011Baier et al, 2012). Similarly, the absence of gravitational signals in space causes astronauts to experience disorienting jumps in perceived orientation (e.g., "upward" suddenly becomes "rightward"; Oman et al, 1986).…”

Section: Introductionmentioning

confidence: 99%

“…Human psychophysical work suggests that an earth-vertical representation arises late in the visual hierarchy (Mitchell and Blakemore, 1972), and clinical studies implicate parietal cortex (Brandt et al, 1994;Funk et al, 2010). The suggestion that a gravity-centered visual representation originates in parietal cortex is consistent with the region's role in multisensory processing and reference frame transformations (Buneo et al, 2002;Avillac et al, 2005;Chang and Snyder, 2010;Seilheimer et al, 2014), but it is unclear which area(s) may be involved.…”

Section: Introductionmentioning

confidence: 99%

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Gravity Influences the Visual Representation of Object Tilt in Parietal Cortex

Rosenberg

Angelaki

2014

J. Neurosci.

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Sensory systems encode the environment in egocentric (e.g., eye, head, or body) reference frames, creating inherently unstable representations that shift and rotate as we move. However, it is widely speculated that the brain transforms these signals into an allocentric, gravity-centered representation of the world that is stable and independent of the observer's spatial pose. Where and how this representation may be achieved is currently unknown. Here we demonstrate that a subpopulation of neurons in the macaque caudal intraparietal area (CIP) visually encodes object tilt in nonegocentric coordinates defined relative to the gravitational vector. Neuronal responses to the tilt of a visually presented planar surface were measured with the monkey in different spatial orientations (upright and rolled left/right ear down) and then compared. This revealed a continuum of representations in which planar tilt was encoded in a gravity-centered reference frame in approximately one-tenth of the comparisons, intermediate reference frames ranging between gravity-centered and egocentric in approximately two-tenths of the comparisons, and in an egocentric reference frame in less than half of the comparisons. Altogether, almost half of the comparisons revealed a shift in the preferred tilt and/or a gain change consistent with encoding object orientation in nonegocentric coordinates. Through neural network modeling, we further show that a purely gravity-centered representation of object tilt can be achieved directly from the population activity of CIP-like units. These results suggest that area CIP may play a key role in creating a stable, allocentric representation of the environment defined relative to an "earth-vertical" direction.

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supporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Gravity Influences the Visual Representation of Object Tilt in Parietal Cortex

Rosenberg

Angelaki

2014

J. Neurosci.

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“…An object’s spatial orientation, for example, is perceived to remain constant relative to the gravitational vector even when your head is tilted to the side. This reflects that the brain uses gravitational (vestibular/proprioceptive) signals to transform the visual representation of the scene from an eye into a world reference frame [36, 37]. Recently, gravitational signals were found to modify the visual responses of neurons in the macaque caudal intraparietal area (CIP) such that object orientation was encoded in a range of intermediate reference frames distributed between head-, eye-, and world-centered (Rosenberg & Angelaki, abstract in Computational and Systems Neuroscience 2013, Salt Lake City, UT, February 2013).…”

Section: Reference Frame Transformationsmentioning

confidence: 99%

Models and processes of multisensory cue combination

Seilheimer

Rosenberg

Angelaki

2014

Current Opinion in Neurobiology

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Fundamental to our perception of a unified and stable environment is the capacity to combine information across the senses. Although this process appears seamless as an adult, the brain’s ability to successfully perform multisensory cue combination takes years to develop and relies on a number of complex processes including cue integration, cue calibration, causal inference, and reference frame transformations. Further complexities exist because multisensory cue combination is implemented by populations of noisy neurons. In this review, we discuss recent behavioral studies exploring how the brain combines information from different sensory systems, neurophysiological studies relating behavior to neuronal activity, and a theory of neural sensory encoding that can account for many of these experimental findings.

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“…One is that we did not control the subjects' trunk and head positions during verticality adjustments. Even though GVS is known to affect head and trunk orientation, its influence on verticality adjustments is controversial [11,22,28,31]. Another limitation is that the order of the different verticality assessments in experiment 1 was not randomized.…”

Section: Time Coursementioning

confidence: 99%