Motion Perception During Variable-Radius Swing Motion in Darkness

Rader, Andrew A.; Oman, Chuck; Merfeld, Daniel M.

doi:10.1152/jn.00116.2009

Cited by 15 publications

(19 citation statements)

References 34 publications

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“…Thus it is essential to train subjects to reduce inter-subject variability and familiarize them with the experimental reporting method. Furthermore, in our earlier study (Rader et al 2009), we confirmed that untrained naïve subjects had much higher reporting variance than trained subjects, though the mean reports were not significantly different without training.…”

Section: Methodssupporting

confidence: 78%

“…All subjects provided informed consent. Six subjects (3 male, 3 female) had participated in a previous separate companion experiment (Rader et al 2009) that used similar motion profiles without visual cues. All ten subjects performed three sessions, totalling 36 trials (3×12), for this study.…”

Section: Methodsmentioning

confidence: 99%

“…We focused on obtaining reliable verbal reports because we have previously found that subjects are able to reliably report their motion as long as 1) tasks are precisely-defined, and 2) a focused training regime is carefully designed not to bias the results (Rader et al 2009). Subject reports were based on a direct magnitude estimation task using real values (inches) rather than ratios.…”

Section: Methodsmentioning

confidence: 99%

“…Specifically, Mittelstaedt and colleagues have reported that truncal receptors influence perceived body tilt (posture) without affecting either perceived subjective visual vertical (perceived orientation of a visual line with respect to the perceived direction of gravity) or perceived head tilt (Mittelstaedt 1999; Mittelsteadt 1997). Given these reports that non-vestibular graviception has a reduced influence on head-bound perception, studies have focused primarily on vestibular perception (arising from forces and accelerations acting on the inner ear) by asking subjects to focus full attention on their head translation and head tilt (Merfeld et al 2005a; Merfeld et al 2005b; Park et al 2006; Rader et al 2009). …”

Section: Introductionmentioning

confidence: 99%

“…The most recent of these studies (Rader et al 2009) reported that perceived head motion for roll-tilt in the absence of visual cues (i.e., in the dark) represented a geometrically consistent compromise of available sensory cues. Specifically, although subjects reported their motion with significant errors for some cue combinations, motion perception was consistent with the geometric constraints of swing motion.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Perceived tilt and translation during variable-radius swing motion with congruent or conflicting visual and vestibular cues

2011

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We examined the influence of dynamic visual scenes on the motion perception of subjects undergoing sinusoidal (0.45 Hz) roll swing motion at different radii. The visual scenes were presented on a flatscreen monitor with a monocular 40° field of view. There were 3 categories of trials: 1. Trials in the dark; 2. Trials where the visual scene matched the actual motion; and 3. Trials where the visual scene showed swing motion at a different radius. Subjects verbally reported perceptions of head tilt and translation. When the visual and vestibular cues differed, subjects reported perceptions that were geometrically consistent with a radius between the radii of the visual scene and the actual motion. Even when sensations did not match either the visual or vestibular stimuli, reported motion perceptions were consistent with swing motions combining elements of each. Subjects were generally unable to detect cue conflicts or judge their own visual-vestibular biases, which suggests that the visual and vestibular self-motion cues are not independently accessible.

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Section: Methodssupporting

confidence: 78%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Perceived tilt and translation during variable-radius swing motion with congruent or conflicting visual and vestibular cues

2011

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Perception of rotation, path, and heading in circular trajectories

et al. 2016

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When in darkness, humans can perceive the direction and magnitude of rotations and of linear translations in the horizontal plane. The current paper addresses the integrated perception of combined translational and rotational motion, as it occurs when moving along a curved trajectory. We questioned whether the perceived motion through the environment follows the predictions of a self-motion perception model (e.g., Merfeld et al. in J Vestib Res 3:141–161, 1993; Newman in A multisensory observer model for human spatial orientation perception, 2009), which assume linear addition of rotational and translational components. For curved motion in darkness, such models predict a non-veridical motion percept, consisting of an underestimation of the perceived rotation, a distortion of the perceived travelled path, and a bias in the perceived heading (i.e., the perceived instantaneous direction of motion with respect to the body). These model predictions were evaluated in two experiments. In Experiment 1, seven participants were moved along a circular trajectory in darkness while facing the motion direction. They indicated perceived yaw rotation using an online tracking task, and perceived travelled path by drawings. In Experiment 2, the heading was systematically varied, and six participants indicated, in a 2-alternative forced-choice task, whether they perceived facing inward or outward of the circular path. Overall, we found no evidence for the heading bias predicted by the model. This suggests that the sum of the perceived rotational and translational components alone cannot adequately explain the overall perceived motion through the environment. Possibly, knowledge about motion dynamics and familiar stimuli combinations may play an important additional role in shaping the percept.

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Human vestibular perceptual thresholds for pitch tilt are slightly worse than for roll tilt across a range of frequencies

Suri

Clark

2020

Exp Brain Res

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Vestibular perceptual thresholds measure vestibular sensory and perceptual noise by quantifying how small of a passive self-motion an individual is able to reliably perceive. Vestibular thresholds have clinical and operational relevance, as they are elevated in vestibular migraine patients, and even healthy individuals with higher (i.e., worse) thresholds have degraded balance. Vestibular thresholds have been quantified across a range of frequencies (motion durations) for rotations and translations, with differences identified for different motion directions (e.g., up/down thresholds are higher than those for left/right motions). While roll tilt thresholds have been well quantified, pitch tilt thresholds have not. Here we aim to quantify pitch tilt thresholds across a range of frequencies and test whether they are higher than in those for roll tilt. In ten normal subjects, we found pitch tilt thresholds at 0.15, 0.2, 0.5 and 1 Hz averaged 1.66, 1.61, 0.99, 0.51 degrees, respectively. Using a general linear model, we found subjects' pitch tilt thresholds were slightly, but significantly, higher than their roll tilt thresholds across all frequencies tested. These differences were approximately 10% at 0.15, 0.2, and 1 Hz and 3% at 0.5 Hz. Pitch tilt thresholds exhibited a similar frequency response as in roll tilt (decreasing a higher frequencies). They also had substantial inter-individual variability, which correlated across pitch tilt frequencies and between pitch and roll tilt thresholds. We discuss why pitch tilt thresholds might be higher, including the pitched-up orientation of the utricular plane of the otoliths, compare to previous studies, and discuss functional implications.

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Motion Perception During Variable-Radius Swing Motion in Darkness

Cited by 15 publications

References 34 publications

Perceived tilt and translation during variable-radius swing motion with congruent or conflicting visual and vestibular cues

Perceived tilt and translation during variable-radius swing motion with congruent or conflicting visual and vestibular cues

Perception of rotation, path, and heading in circular trajectories

Human vestibular perceptual thresholds for pitch tilt are slightly worse than for roll tilt across a range of frequencies

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