Perceptual compensation For self-movement and object distance in vision and hearing

Haynes, Joshua 2023. Perceptual compensation For self-movement and object distance in vision and hearing. PhD Thesis, Cardiff University. Item availability restricted.

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Abstract

The overarching theme of this thesis is investigating perceptual compensation while determining object movements. The two forms of compensation highlighted here are compensation for self-movement, as self-movement creates reafferent motion in the image that must be interpreted when determining the movement of objects, and auditory speed constancy, or the compensation for object distance that we are able to perform when determining object movement. A new paradigm is introduced and used throughout most of the thesis to investigate the precision of the image and non-image signals that we use during compensation for self-controlled self-movements, with the complications of allowing participants to control the stimulus accounted for in a new psychometric model that includes an external source of variability not present in standard cumulative Gaussian fits. The precision of the non-image signals is a main focus throughout, with discussion surrounding the finding that non-image signal precision depends on the modality of the image, that the non-image signal follows Weber’s law while image signals do not, and that the standard Bayesian model of movement perception is not relevant in the context of self-controlled head-rotations. These “anti-Bayesian” results are verified quantitatively with proof that a Bayesian model derived here, that can account for the stimuli being participant controlled, is a less good fit than the psychometric model mentioned above. The first investigation into auditory speed constancy is presented in this thesis, with results suggesting that individual differences in distance perception underly the incomplete speed constancy that is found. These findings are summarised in the context of using compensation to interpret the movement of ourselves and visual and auditory objects at different distances from us.

Item Type:	Thesis (PhD)
Date Type:	Completion
Status:	Unpublished
Schools:	Psychology
Date of First Compliant Deposit:	21 March 2024
Last Modified:	21 Mar 2024 16:54
URI:	https://orca.cardiff.ac.uk/id/eprint/167355

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