Adaptive psychophysical procedures

Treutwein, Bernhard

doi:10.1016/0042-6989(95)00016-s

Cited by 181 publications

(226 citation statements)

References 50 publications

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“…This assumption has been successfully challenged for contrast sensitivity (Burkhardt et al 1984; Garcia-Perez and Alcala-Quintana 2009) and time perception (Wackermann and Spati 2006). However, symmetry is still assumed in the experimental design and analysis of most psychophysical experiments (Treutwein 1995;Leek 2001;Macmillan and Creelman 2005). In many prior vestibular perception studies, it has been assumed in both the design of the experiment and analysis of the responses that perceptual thresholds are similar in opposite directions of movement (Melvill Jones and Young 1978;Grabherr et al 2008;MacNeilage et al 2010).…”

Section: Perceptual Asymmetriesmentioning

confidence: 99%

“…Forced choice methods have now standardized threshold determination in several fields of psychophysics (Treutwein 1995;Leek 2001;Knill and Pouget 2004), and these techniques are now the standard method of assessing motion perception thresholds Grabherr et al 2008;Gu et al 2008;MacNeilage et al 2010;Mallery et al 2010). These techniques have the advantage of largely eliminating the tendency to bias one choice, but make the assumption that the choices have equal thresholds.…”

Section: Introductionmentioning

confidence: 99%

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Directional Asymmetries and Age Effects in Human Self-Motion Perception

Roditi

Crane

2012

JARO

109

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Directional asymmetries in vestibular reflexes have aided the diagnosis of vestibular lesions; however, potential asymmetries in vestibular perception have not been well defined. This investigation sought to measure potential asymmetries in human vestibular perception. Vestibular perception thresholds were measured in 24 healthy human subjects between the ages of 21 and 68 years. Stimuli consisted of a single cycle of sinusoidal acceleration in a single direction lasting 1 or 2 s (1 or 0.5 Hz), delivered in sway (leftright), surge (forward-backward), heave (up-down), or yaw rotation. Subject identified self-motion directions were analyzed using a forced choice technique, which permitted thresholds to be independently determined for each direction. Non-motion stimuli were presented to measure possible response bias. A significant directional asymmetry in the dynamic response occurred in 27% of conditions tested within subjects, and in at least one type of motion in 92% of subjects. Directional asymmetries were usually consistent when retested in the same subject but did not occur consistently in one direction across the population with the exception of heave at 0.5 Hz. Responses during null stimuli presentation suggested that asymmetries were not due to biased guessing. Multiple models were applied and compared to determine if sensitivities were direction specific. Using Akaike information criterion, it was found that the model with direction specific sensitivities better described the data in 86% of runs when compared with a model that used the same sensitivity for both directions. Mean thresholds for yaw were 1.3±0.9°/s at 0.5 Hz and 0.9±0.7°/s at 1 Hz and were independent of age. Thresholds for surge and sway were 1.7±0.8 cm/s at 0.5 Hz and 0.7±0.3 cm/s at 1.0 Hz for subjects G50 and were significantly higher in subjects 950 years old. Heave thresholds were higher and were independent of age.

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Section: Perceptual Asymmetriesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Directional Asymmetries and Age Effects in Human Self-Motion Perception

Roditi

Crane

2012

JARO

109

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“…The percentage of incorrect responses to catch trials was used as an estimate of lapse rate for fitting psychometric functions (Treutwein, 1995). The data were bootstrapped and fit with a cumulative Gaussian function to obtain an estimate of the coherence level required for correct detection 75% of the time in log units (see Manning et al, 2013).…”

Section: Data Screening and Transformationmentioning

confidence: 99%

Brief Report: Coherent Motion Processing in Autism: Is Dot Lifetime an Important Parameter?

Manning

Charman

Pellicano

2015

J Autism Dev Disord

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Contrasting reports of reduced and intact sensitivity to coherent motion in autistic individuals may be attributable to stimulus parameters. Here, we investigated whether dot lifetime contributes to elevated thresholds in children with autism. We presented a standard motion coherence task to 31 children with autism and 31 typical children, with both limited and unlimited lifetime conditions. Overall, children had higher thresholds in the limited lifetime condition than in the unlimited lifetime condition. Yet children with autism were affected by this manipulation to the same extent as typical children and were equally sensitive to coherent motion. Our results suggest that dot lifetime is not a critical stimulus parameter and speak against pervasive difficulties in coherent motion perception in children with autism.

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“…To determine one of the geometric parameters, subjects moved the manipulandum in the horizontal plane as often as they liked along a haptic boundary that was about 15 cm long. For example, in our study of line orientation, subjects ascertained the direction of tilt of the boundary, clockwise (CW) or counterclockwise (CCW) from the frontal or the sagittal plane, in a 2-alternative forced-choice (2-AFC) procedure (Treutwein 1995). Based on the answer for each trial, the direction and amount of tilt for the next trial were adjusted using a pair of adaptive staircases (Fig.…”

Section: I S T O R T I O N S I N H a P T I C S P A C Ementioning

confidence: 99%

Approaches to the Study of Haptic Sensing

Henriques¹,

Soechting²

2005

Journal of Neurophysiology

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Henriques, Denise Y. P. and John F. Soechting. Approaches to the study of haptic sensing. J Neurophysiol 93: 3036 -3043, 2005; doi:10.1152/jn.00010.2005. This review surveys results from a new approach to the problem of haptic sensing, in which subjects use primarily proximal arm movements to explore the shapes of virtual objects. These shapes are generated using a robotically controlled manipulandum. We begin by summarizing distortions of simple geometric properties (such as the length and orientation of lines) in the haptic perception of space. We then consider the extent to which the sense of more complex shapes (such as quadrilaterals) can be explained by these geometric distortions, i.e., the extent to which the shape of a complex object is synthesized from simpler constituent elements, and some of the sensory cues that may be important in this process. Haptic and visual processing of shapes appear to lead to some similar illusions. However, we argue that the processing of haptic information differs fundamentally from visual processing in that the former requires the integration of information that evolves in time as well as in space.

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Adaptive psychophysical procedures

Cited by 181 publications

References 50 publications

Directional Asymmetries and Age Effects in Human Self-Motion Perception

Directional Asymmetries and Age Effects in Human Self-Motion Perception

Brief Report: Coherent Motion Processing in Autism: Is Dot Lifetime an Important Parameter?

Approaches to the Study of Haptic Sensing

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