2 edition of Displacement thresholds in oscillatory movement perception. found in the catalog.
Displacement thresholds in oscillatory movement perception.
David J. Whitaker
Written in English
Ph.D. thesis. Typescript.
Methods: To measure OS, an ascending threshold method was used where a simple target was presented, with increasing oscillations until perception of movement occurred. Healthy participants (N = 37), with a mean age of ± years, were asked to indicate when the high contrast circular (2 mm) target began oscillating on a stationary. Oscillatory motion is defined as the to and fro motion of an object from its mean position. The ideal condition is that the object can be in oscillatory motion forever in the absence of friction but in the real world, this is not possible and the object has to settle into equilibrium.
Test your knowledge on all of Review of Oscillations. Perfect prep for Review of Oscillations quizzes and tests you might have in school. Similarly, showed nearly equal weighting when asking for absolute displacement estimates in an oscillatory up-down movement with – and – for the visual and vestibular weights, respectively, depending on motion amplitude.
Problem: A disk of mass 2 kg and radius.5 m is hung from a wire, then rotated a small angle such that it engages in torsional oscillation. The period of oscillation is measured at 2 seconds. Given that the moment of inertia of a disk is given by I =, find the torsional constant, κ, of the wire. To solve this problem we use the equation for the period of a torsional oscillator. Oscillation is the repetitive variation, typically in time, of some measure about a central value (often a point of equilibrium) or between two or more different term vibration is precisely used to describe mechanical oscillation. Familiar examples of oscillation include a swinging pendulum and alternating current.. Oscillations occur not only in mechanical systems but also in.
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Displacement thresholds were determined for unidirectional linear movement (A-B motion) and oscillatory movement (A-B-A motion) for various periods of motion.
Both functions exhibited similar increases in motion thresholds for durations of movement greater than msec, and nearly constant motion thresholds for durations of movement between Cited by: Conventional resolution tests fail to differentiate between neural and optical causes of visual loss.
The oscillatory movement displacement threshold—the smallest amplitude of oscillation which gives rise to the perception of movement—provides an alternative hyperacuity test. This may offer advantages over vernier by: Displacement thresholds for movement motion and the filled circles and dashed lines indicate the data for A-B-A or oscillatory motion.
Note that the period of movement values on the abscissa refer to the transit time from one point to another; thus. the total amount of time for A-B-A motion was twice as long as for A-B by: Earlier work has established that oscillatory movement displacement thresholds (OMDT) are a form of hyperacuity.
There is speculation that the mechanism determining OMDT, like motion perception in general, involves direct motion sensing at high temporal frequencies of oscillation and spatial localization processes (from which motion is inferred) at low temporal freqeuncies, which Cited by: 6.
Oscillatory movement displacement thresholds (OMDTs) also produce thresholds in the hyperacuity range, under certain conditions. The OMDT can be defined as the smallest amplitude of displacement that elicits the perception of movement for a given temporal frequency of oscillation.
The range over which OMDTs are usually determined is by: 4. If it is assumed that oscillatory stimuli isolate the activity of velocity tuned mechanisms and that the contribution of displacement-sensitive mech- anisms decreases in the periphery, then il might be Displacement threshold A-a 2 5 10 20 SO P, period of motion (in msec) Fig.
Visual movement perception. New search | Advanced search | Search results: Login Displacement thresholds in oscillatory movement perception Author: Whitaker, D. ISNI: X Awarding Body: University of Bradford Current Institution: University of Bradford Date of Award: Availability of Full Text.
Oscillatory motion is the repeated to and fro movement of a system from its equilibrium position. Simple harmonic motion is the simplest type of oscillatory motion. In practice, oscillatory motion eventually comes to rest due to damping or frictional forces.
Oscillatory movement displacement thresholds increase with ageing Wertheimer, M, / “On the phi phenomenon as an example of nativism in perception”, in A Source Book in the History of Psychology Eds Herrnstein, R J, Boring, E G ( - University of Bradford: PhD "Displacement thresholds in oscillatory movement perception".
- University of Bradford: BSc (1st class Hons.): Ophthalmic Optics (Optometry) - - Bradford Grammar School: Maths A-level (A), Physics A-level (A), Chemistry A-level (A) Academic and Professional Appointments.
The influence of luminance on displacement thresholds for continuous oscillatory movement. Buckingham T, Whitaker D. Displacement thresholds were determined for a sinusoidally-modulated contrast grating, having a spatial frequency of 2 c/deg, whose mean luminance could be varied.
The grating underwent continuous oscillatory simple harmonic motion. Displacement thresholds were determined for durations of movement between 10 msec and sec, with and without the presence of a reference line. For all durations of movement, displacement thresholds were lower when a reference line was present.
The magnitude of this effect was essentially constant across all durations of movement. Oscillatory thresholds. Figure 3 illustrates the pseudo-3D maps for Participant 1 (P1) and the ability of the VPS1 to rotate the map to view thresholds in their natural three-dimensional space.
This rotation allows examiners to more easily assess or visualise magnitudes of the OT. Even though this feature is available and extremely useful, the majority of pseudo-3D maps herein will be rotated. Vision Res. ;21(8) Displacement thresholds for unidirectional and oscillatory movement.
Scobey RP, Johnson CA. PMID: The validity of movement detection thresholds to glaucoma has been noted for oscillatory movement thresholds of a line target by Fitzke et al. (), and for random dots by Silverman et al. ( Displacement thresholds for continuous oscillatory movement were determined for ten subjects in each of three age groups, and years.
Oscillation frequencies of 1, 2, 3, 5, 8, 13 and 20 Hz were used, all subjects having a corrected visual acuity of 6/5. Abstract— Displacement thresholds for continuous oscillatory movement of a grating, subtending 2 cycle deg‐1, were measured for square‐, triangular‐and sine‐wave oscillation over the frequency range 1–20 Hz.
Without reference lines, thresholds were highly dependent upon temporal frequency and oscillation waveform. With reference lines, thresholds were dependent upon oscillation. Experiments 1 and 2 established children’s (mean age 3 years, 7 months) subject-relative and object-relative motion thresholds at 1°′/sec and 1°′/sec, respectively, speeds well above those found for adults.
Experiment 3 established that preschoolers, like adults, attribute object-relative motion to the smaller of two objects, with the inducing properties of the larger stimulus. The median velocity thresholds for the perception of direction of linear movement for anterior-posterior movement was cm/s and for lateral movement was cm/s.
Comparison between oscillatory movements. We were interested in examining how the different oscillatory movements were related to each other. A repeated measures ANOVA analysis revealed a main effect of the movement [F (4, 36) =p = ].
A summary of. Hyperacuity thresholds were obtained at a separate visit, using both Vernier and oscillatory motion displacement stimuli (OMDT). Re-test data for all tests was collected from a random sample of 30 children after a period of at least two weeks.Even stars oscillates.
Waves- from sound to ocean waves to seismic waves in the solid earth- ultimately involve oscillatory motion. Here in fig we can see two quantities that describes the oscillatory motion; Amplitude is the maximum displacement from equilibrium, and period is the time it takes for the motion to repeat itself.THERE have been many reports that the threshold for perception of a test flash is raised during a saccadic eye movement1–4.
Even with a flash brief enough to eliminate any blurring of its.