Difference Threshold: Measurement and Modeling

Naseri, Amir; Grant, Peter R.

doi:10.2514/6.2011-6245

Cited by 4 publications

(1 citation statement)

References 18 publications

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“…These results suggest that if perceptual discrimination is modulated only by the SNR of the motion stimulus, then motion discrimination is predicted to be proportionally better for downward as compared to upward motions and for higher as compared to lower motion intensities. Experimental data on human motion sensitivity over wide motion ranges [15], [21], [22],…”

Section: Compared Profiles (Reference Vs Comparison) [ M/s 2 ] Rms Amentioning

confidence: 99%

The Importance of Stimulus Noise Analysis for Self-Motion Studies

Nesti

Beykirch

MacNeilage³

et al. 2014

PLoS ONE

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Motion simulators are widely employed in basic and applied research to study the neural mechanisms of perception and action during inertial stimulation. In these studies, uncontrolled simulator-introduced noise inevitably leads to a disparity between the reproduced motion and the trajectories meticulously designed by the experimenter, possibly resulting in undesired motion cues to the investigated system. Understanding actual simulator responses to different motion commands is therefore a crucial yet often underestimated step towards the interpretation of experimental results. In this work, we developed analysis methods based on signal processing techniques to quantify the noise in the actual motion, and its deterministic and stochastic components. Our methods allow comparisons between commanded and actual motion as well as between different actual motion profiles. A specific practical example from one of our studies is used to illustrate the methodologies and their relevance, but this does not detract from its general applicability. Analyses of the simulator’s inertial recordings show direction-dependent noise and nonlinearity related to the command amplitude. The Signal-to-Noise Ratio is one order of magnitude higher for the larger motion amplitudes we tested, compared to the smaller motion amplitudes. Simulator-introduced noise is found to be primarily of deterministic nature, particularly for the stronger motion intensities. The effect of simulator noise on quantification of animal/human motion sensitivity is discussed. We conclude that accurate recording and characterization of executed simulator motion are a crucial prerequisite for the investigation of uncertainty in self-motion perception.

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Section: Compared Profiles (Reference Vs Comparison) [ M/s 2 ] Rms Amentioning

confidence: 99%

The Importance of Stimulus Noise Analysis for Self-Motion Studies

Nesti

Beykirch

MacNeilage³

et al. 2014

PLoS ONE

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Human discrimination of head-centred visual–inertial yaw rotations

et al. 2015

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To successfully perform daily activities such as maintaining posture or running, humans need to be sensitive to self-motion over a large range of motion intensities. Recent studies have shown that the human ability to discriminate self-motion in the presence of either inertial-only motion cues or visual-only motion cues is not constant but rather decreases with motion intensity. However, these results do not yet allow for a quantitative description of how self-motion is discriminated in the presence of combined visual and inertial cues, since little is known about visual–inertial perceptual integration and the resulting self-motion perception over a wide range of motion intensity. Here we investigate these two questions for head-centred yaw rotations (0.5 Hz) presented either in darkness or combined with visual cues (optical flow with limited lifetime dots). Participants discriminated a reference motion, repeated unchanged for every trial, from a comparison motion, iteratively adjusted in peak velocity so as to measure the participants’ differential threshold, i.e. the smallest perceivable change in stimulus intensity. A total of six participants were tested at four reference velocities (15, 30, 45 and 60 °/s). Results are combined for further analysis with previously published differential thresholds measured for visual-only yaw rotation cues using the same participants and procedure. Overall, differential thresholds increase with stimulus intensity following a trend described well by three power functions with exponents of 0.36, 0.62 and 0.49 for inertial, visual and visual–inertial stimuli, respectively. Despite the different exponents, differential thresholds do not depend on the type of sensory input significantly, suggesting that combining visual and inertial stimuli does not lead to improved discrimination performance over the investigated range of yaw rotations.

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Motion cueing optimisation applied to rotorcraft flight simulation

Jones

2017

CEAS Aeronaut J

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Difference Threshold: Measurement and Modeling

Cited by 4 publications

References 18 publications

The Importance of Stimulus Noise Analysis for Self-Motion Studies

The Importance of Stimulus Noise Analysis for Self-Motion Studies

Human discrimination of head-centred visual–inertial yaw rotations

Motion cueing optimisation applied to rotorcraft flight simulation

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