An Effect of Acceleration on Passively-Changed Arm-Velocity Perception

2018 ◽  
Author(s):  
Takaaki Yasui ◽  
Fumihiro Akatsuka ◽  
Yoshihiko Nomura ◽  
Tokuhiro Sugiura
Keyword(s):  
Motor Learning ◽  
Control Systems ◽  
Constant Acceleration ◽  
Velocity Change ◽  
Measured Velocity ◽  
Haptic Devices ◽  
Change Perception ◽  
Velocity Perception ◽  
Perceived Velocity

In recent years, the methods of motor learning using haptic devices that can give motion-related stimuli to learners have been studied. In order to design control systems of the haptic devices that can give learners stimuli so that they can perceive them with proprioception, we need to understand the characteristics of human’s position and velocity sensations. Then, in this study, we examined velocity JNDs (Just Noticeable Differences), in order to understand human velocity-change perception. We, in particular, focused on an effect of acceleration during velocity-change to human velocity-change perception. In the experiment, we enforced subjects to accelerate their hands with a constant acceleration of 1, 8, 16, 32 deg/s2 from before-acceleration velocity of 10 deg/s. Subjects answered whether they perceived velocity-change or not, and we measured velocity JNDs. As a result, it was found that, while the accelerations increased by 32 times, the velocity JNDs decreased by only about 1/2, i.e., from 8.1 to 4.2 deg/s. From this result, it was concluded that the magnitude of acceleration is not a determinative factor for velocity-change perception but a supplementary one.

Linear Acceleration Modifies the Perceived Velocity of a Moving Visual Scene

Perception ◽  
1977 ◽  
Vol 6 (5) ◽  
pp. 529-540 ◽  
Author(s):  
Bernard Pavard ◽  
Alain Berthoz
Keyword(s):  
Simple Model ◽  
Spatial Frequency ◽  
Visual Stimulus ◽  
Linear Acceleration ◽  
Vestibular Stimulation ◽  
Visual Scene ◽  
Image Velocity ◽  
Image Movement ◽  
Velocity Perception ◽  
Perceived Velocity

In the present work, we have shown the effect of a vestibular stimulation on the velocity perception of a moving scene. The intensity of this effect is related to the amplitude of the cart acceleration, image velocity, spatial frequency of the visual stimulus, and the angle between the directions of cart and image movement. A simple model has been developed to determine whether the perception of visual movement is due to the geometric projection of the vestibular evaluation on the visual vector, or the inverse.

scholarly journals ABSORPTION OF ENERGY EXPLOITATION DURING IMPACT OF AIRCRAFT

Aviation ◽  
2004 ◽  
Vol 8 (2) ◽  
pp. 3-8
Author(s):  
Antanas Žiliukas ◽  
Nina Fiodorova
Keyword(s):  
Pulse Shape ◽  
Maximum Velocity ◽  
Rectangular Pulse ◽  
Constant Acceleration ◽  
Velocity Change ◽  
Stopping Distance ◽  
Energy Exploitation ◽  
Deceleration Time

The article shows the variation of stopping distance as a function of deceleration and velocity change derived from the standard Newtonian equations for assumed constant acceleration. Note that the time to stop is equal for all three triangular deceleration‐time pulses but that the stopping distances are not. Minimum stopping distance is achieved with a rectangular pulse, and hence it is the most desired pulse shape from a consideration of deceleration from maximum velocity at a given deceleration level in the shortest possible distance.

scholarly journals Visual-Motor Learning Using Haptic Devices: How Best to Train Surgeons?

i-Perception ◽  
10.1068/id231 ◽  
2012 ◽  
Vol 3 (4) ◽  
pp. 231-231
Author(s):  
Oscar Giles ◽  
Emily Burns ◽  
Callum Mole ◽  
Pete Culmer ◽  
Mark Mon-Williams ◽  
...  
Keyword(s):  
Motor Learning ◽  
Haptic Devices ◽  
Visual Motor

Velocity Perception in 3-D Environments

Perception ◽  
1996 ◽  
Vol 25 (1_suppl) ◽  
pp. 37-37 ◽  
Author(s):  
H Distler ◽  
H H Bülthoff
Keyword(s):  
Spatial Frequency ◽  
Surface Texture ◽  
Low Frequency ◽  
Picture Plane ◽  
Open Loop ◽  
Driving Simulation ◽  
Low Contrast ◽  
Surface Textures ◽  
Velocity Perception ◽  
Perceived Velocity

Velocity perception has been investigated in many experiments with stimuli moving in the picture plane (2-D). For example, experiments with sine-wave gratings have shown that high-frequency patterns are perceived as moving faster than low-frequency patterns, and that high-contrast patterns are perceived as moving faster than low-contrast patterns. We investigated the influence of contrast and spatial frequency on perceived velocity in an open-loop driving simulation to determine whether contrast and spatial frequency account for differences in perceived velocity in complex 3-D environments. The simulated scene consisted of a textured road flanked by two meadows. We used road surface textures with different contrast and spatial frequency contents. In a 2AFC paradigm participants were simultaneously presented two driving simulation sequences depicting vehicles moving at different velocities on roads with different surface textures. Participants judged which vehicle was moving faster. Using an adaptive staircase procedure we determined the point of subjective equality for roads with different surface textures. The results show that perceived velocity in a driving simulation does depend on contrast and spatial frequency of the surface texture. Perceived velocity can be increased by increasing the contrast or the relative amount of high spatial frequencies in the surface texture. The relevance of these results for the design of driving simulators is discussed.

Acceleration bias in visually perceived velocity change and effects of Parkinson’s bradykinesia

Neuroreport ◽  
2013 ◽  
Vol 24 (14) ◽  
pp. 773-778 ◽  
Author(s):  
Martijn Beudel ◽  
Crista M. de Geus ◽  
Klaus L. Leenders ◽  
Bauke M. de Jong
Keyword(s):  
Velocity Change ◽  
Perceived Velocity

scholarly journals Changes in Center of Mass during Preliminary Motion for Prediction of Direction Change

2021 ◽  
Keyword(s):  
Control Systems ◽  
Human Behavior ◽  
Research Group ◽  
Daily Life ◽  
Center Of Mass ◽  
Velocity Change ◽  
Living Space ◽  
Direction Change ◽  
Straight Line ◽  
Prediction Parameters

Abstract. In recent years, the number of single elderly people has been increasing, and the needs of residents have been diversifying. Towards these backgrounds, we propose the concept of "Biofiled bulding". The aim of Biofied Building is to create living spaces where residents can live safely, securely and comfortably. Small robots are used as an interface between residents and living space in Biofied Building. The aim of using robots is to sense the position and movement of residents in real time and providing feedback to them. However,he present control systems of the robot do not have enough functions to estimate the risk of accidents such as falls and choose the pathways which do not disturb residents. Therefore, the purpose of this research is to recognize and predict human behavior in a living space by using a robot to realize Biofied Building. In particular, we focus on the direction change motion, which is an important behavior in a living space, and extract the prediction parameters. In particular, it is reported that the direction change motion account for about 20% of gait during the daily life. Therefore, our research group decided to focus on direction change motion. In this study, we focused on the center of the head to extract parameters for prediction of the direction change motion. There are features in the velocity change of the center of the head compared with straight-line gait. There was a velocity amplification of the opposite direction of the direction change before the start of the motion. It is assumed that the shift of the center of mass make it to easier to step out to the direction of the turn.

Sign in / Sign up

Export Citation Format

Share Document