Perception of illusory movement

Nature ◽  
1979 ◽  
Vol 281 (5732) ◽  
pp. 565-566 ◽  
Author(s):  
Alex Fraser ◽  
Kimerly J. Wilcox
Keyword(s):  
Illusory Movement

scholarly journals Influence of virtual reality visual feedback on the illusion of movement induced by tendon vibration of wrist in healthy participants

PLoS ONE ◽  
2020 ◽  
Vol 15 (11) ◽  
pp. e0242416
Author(s):  
Salomé Le Franc ◽  
Mathis Fleury ◽  
Mélanie Cogne ◽  
Simon Butet ◽  
Christian Barillot ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Visual Feedback ◽  
Visual Cues ◽  
Static Condition ◽  
Likert Scale ◽  
Tendon Vibration ◽  
Virtual Hand ◽  
Significant Difference ◽  
Illusory Movement ◽  
Healthy Participants

Introduction Illusion of movement induced by tendon vibration is an effective approach for motor and sensory rehabilitation in case of neurological impairments. The aim of our study was to investigate which modality of visual feedback in Virtual Reality (VR) associated with tendon vibration of the wrist could induce the best illusion of movement. Methods We included 30 healthy participants in the experiment. Tendon vibration inducing illusion of movement (wrist extension, 100Hz) was applied on their wrist during 3 VR visual conditions (10 times each): a moving virtual hand corresponding to the movement that the participants could feel during the tendon vibration (Moving condition), a static virtual hand (Static condition), or no virtual hand at all (Hidden condition). After each trial, the participants had to quantify the intensity of the illusory movement on a Likert scale, the subjective degree of extension of their wrist and afterwards they answered a questionnaire. Results There was a significant difference between the 3 visual feedback conditions concerning the Likert scale ranking and the degree of wrist’s extension (p<0.001). The Moving condition induced a higher intensity of illusion of movement and a higher sensation of wrist’s extension than the Hidden condition (p<0.001 and p<0.001 respectively) than that of the Static condition (p<0.001 and p<0.001 respectively). The Hidden condition also induced a higher intensity of illusion of movement and a higher sensation of wrist’s extension than the Static condition (p<0.01 and p<0.01 respectively). The preferred condition to facilitate movement’s illusion was the Moving condition (63.3%). Conclusions This study demonstrated the importance of carefully selecting a visual feedback to improve the illusion of movement induced by tendon vibration, and the increase of illusion by adding VR visual cues congruent to the illusion of movement. Further work will consist in testing the same hypothesis with stroke patients.

scholarly journals Imagination der Bewegung durch Vibrationsreize – ein neuer Ansatz in der Frühmobilisation auf der Intensivstation?

2020 ◽  
Vol 26 (4) ◽  
pp. 214-218
Author(s):  
M. Lippert-Grüner ◽  
B. Bakaláø ◽  
R. Zajíèek ◽  
F. Duška
Keyword(s):  
Nervous System ◽  
Intensive Care ◽  
Pilot Study ◽  
Sensory Information ◽  
Early Mobilization ◽  
Motor Units ◽  
The Body ◽  
Entire Body ◽  
Vibration Effect ◽  
Illusory Movement

Zusammenfassung Die Optimierung der motorischen Leistung und die Einbindung und Vernetzung bisher nicht verwendeter motorischer Einheiten sowie die vermehrte Ausschüttung neurotropher Faktoren sind zentrale Mechanismen der Vibrationswirkung, die therapeutisch auf einzelne Körperteile oder den gesamten Körper angewendet werden können. Eine Möglichkeit, die Frühmobilisation bei kritisch kranken Patienten effektiver zu gestalten und immobilitätsbedingten Veränderungen vorzubeugen, könnte die Verwendung des Vibramoov™-Systems sein. Gezielt programmierte Vibrationssequenzen stimulieren hier das Nervensystem mit sensorischen Informationen, die die Empfindung einer Bewegung nachahmen (z. B. des Gehens) und somit Regenerations- und Reor-ganisationsprozesse im zentralen Nervensystem unterstützen können. Von Bedeutung ist dieser Therapieansatz vor allem bei Patienten, bei denen aufgrund ihres Zustandes konventionelle Maßnahmen nicht oder nur eingeschränkt durchgeführt werden können. Da bisher keine Erfah-rungen zur Anwendung bei intensivpflichtigen Patienten verfügbar sind, wurde eine Pilotstudie durchgeführt mit der Fragestellung, ob diese Therapieform sicher ist und im normalen Betrieb auf der Intensivstation verwendet werden kann. Die Ergebnisse der Pilotstudie mit fünf Patienten zei-gen, dass die Anwendung von Vibramoov™ zu keiner wesentlichen Veränderung kardiopulmo-naler Parameter im Sinne einer Non-Toleranz führte und im klinischen Setting gut umsetzbar war. Schlüsselwörter: Frührehabilitation, Imagination von Bewegung, Intensivstation, Vibramoov™ Imagination of movement through vibrational stimuli – a new approach to early mobilization in intensive care units? A pilot study Abstract The optimization of motor performance and the integration and networking of previously unused motor units, as well as the increased release of neurotrophic factors, are central mechanisms related to the vibration effect that can be applied therapeutically to individual parts of the body or to the entire body. One way to make early mobilization more effective in critically ill patients and to prevent changes due to immobility could be rehabilitation with functional proprioceptive stimulation, also known as “illusory movement”. Specifically programmed vibration sequences stimulate the nervous system with sensory information that mimics the sensation of movement (e. g., walking) and can thus support regeneration and reorganization processes in the central nervous system. This therapeutic approach is particularly important for patients who, due to their condition, cannot – or only to a limited extent – carry out conventional measures. Since no experience has so far been available for use in intensive care patients, we carried out a pilot study to answer the question of whether this form of therapy can be used safely and in normal operations in the intensive care unit. The results of the pilot study with 5 patients showed that the use of Vibramoov™ did not lead to any significant change in cardiopulmonary parameters in terms of non-tolerance and was easy to implement in a clinical setting. Keywords: early rehabilitation, illusory movements, ICU, functional proprio-ceptive stimulation

scholarly journals Families of stationary patterns producing illusory movement: insights into the visual system

1997 ◽  
Vol 264 (1383) ◽  
pp. 795-806 ◽  
Author(s):  
Cornelia Fermüller ◽  
Robert Pless ◽  
Yiannis Aloimonos
Keyword(s):  
Visual System ◽  
Illusory Movement

scholarly journals Quantitative Analysis of Illusory Movement: Spatial Filtering and Line Localization in the Human Visual System

Perception ◽  
10.1068/p7716 ◽  
2014 ◽  
Vol 43 (12) ◽  
pp. 1329-1340 ◽  
Author(s):  
Nomdo M Jansonius ◽  
Lucas Stam ◽  
Tim de Jong ◽  
Ben A Pijpker
Keyword(s):  
Quantitative Analysis ◽  
Visual System ◽  
Human Visual System ◽  
Spatial Filtering ◽  
Illusory Movement

The Autokinetic Projective Test: A Cautionary Note

1988 ◽  
Vol 15 (1) ◽  
pp. 44-46 ◽  
Author(s):  
Eugene Lovelace
Keyword(s):  
Original Study ◽  
Cautionary Note ◽  
Projective Test ◽  
Projective Technique ◽  
Illusory Movement

Textbook discussions of the autokinetic effect often mention that this illusory movement is susceptible to suggestion. Several recently published perception texts have presented the autokinetic effect as a potential projective technique, because it is claimed that the light will write out words if the observer expects it to. The accounts in these textbooks are misleading; in a study we conducted, as well as in the original study cited by the texts, the modal event across a series of trials was a failure to see the suggested “writing” movement.

Apparent Movements Induced by Luminance Modulations: A Model Study

Perception ◽  
1988 ◽  
Vol 17 (5) ◽  
pp. 667-679 ◽  
Author(s):  
Henk A K Mastebroek ◽  
Willem H Zaagman
Keyword(s):  
Receptive Field ◽  
Stimulus Pattern ◽  
Input Output ◽  
Zero Crossings ◽  
Model Study ◽  
Illusory Movement ◽  
Dimensional Distribution ◽  
Full Analysis ◽  
Spatial Derivatives ◽  
Visual Percept

When the receptive-field profiles of the different units in the primary visual cortex are described by a series of different functions which are given by a Gaussian distribution and its first, second, and so on, spatial derivatives, a full analysis of the input—output processing of these units (under the assumption of linearity for small signals) can be achieved for a wide variety of optical stimuli consisting of closely adjacent fields modulated independently in intensity. Once the input—output relationship for one particular unit has been obtained, it is possible to calculate in a straightforward manner the spatial representation of the stimulus pattern in a two-dimensional distribution of such units. Investigations are reported into how a stimulus pattern (a dark or bright bar between two fields modulated in illuminance) is represented in a hierarchical structure of such layers of units, each layer containing just one type of receptive-field profile from the Gaussian family of derivatives. It is shown that if a visual percept is associated with the behaviour of the extrema or zero-crossings of the representations in the first few layers of such an architecture, a complete description can be given of the experimental results obtained by Gregory and Heard in their psychophysical experiments on illusory movement perception induced by luminance intensity modulations.

Optokinetic stimulation induces illusory movement of both out-of-the-body and on-the-body hand-held visual objects

2009 ◽  
Vol 193 (4) ◽  
pp. 633-638 ◽  
Author(s):  
P. Revol ◽  
A. Farnè ◽  
L. Pisella ◽  
N. P. Holmes ◽  
A. Imai ◽  
...  
Keyword(s):  
The Body ◽  
Optokinetic Stimulation ◽  
Visual Objects ◽  
Illusory Movement

IMITATION OF VISUAL ILLUSIONS VIA OPENCV AND CNN

2008 ◽  
Vol 18 (12) ◽  
pp. 3551-3609 ◽  
Author(s):  
MAKOTO ITOH ◽  
LEON O. CHUA
Keyword(s):  
Neural Networks ◽  
Computer Vision ◽  
Visual Illusion ◽  
Visual Illusions ◽  
Color Spreading ◽  
Brain Functions ◽  
Morphological Gradient ◽  
Illusory Movement ◽  
Neon Color Spreading ◽  
High Level

Visual illusion is the fallacious perception of reality or some actually existing object. In this paper, we imitate the mechanism of Ehrenstein illusion, neon color spreading illusion, watercolor illusion, Kanizsa illusion, shifted edges illusion, and hybrid image illusion using the Open Source Computer Vision Library (OpenCV). We also imitate these illusions using Cellular Neural Networks (CNNs). These imitations suggest that some illusions are processed by high-level brain functions. We next apply the morphological gradient operation to anomalous motion illusions. The processed images are classified into two kinds of images, which correspond to the central drift illusion and the peripheral drift illusion, respectively. It demonstrates that the contrast of the colors plays an important role in the anomalous motion illusion. We also imitate the anomalous motion illusions using both OpenCV and CNN. These imitations suggest that some visual illusions may be processed by the illusory movement of animations.

Forearm vs Whole-Body Sensations of Self-Motion: Some Results on the Role of the Sensorimotor Context

1988 ◽  
Vol 67 (2) ◽  
pp. 351-358
Author(s):  
Marie-Françoise Tardy-Gervet ◽  
Jean-Claude Gilhodes ◽  
Jean-Pierre Roll
Keyword(s):  
The Other ◽  
Whole Body ◽  
Individual Factors ◽  
Stimulus Parameters ◽  
Illusory Movement ◽  
Body Sensations ◽  
Self Motion

Making a subject's visual surroundings move can give rise to sensations of self-motion, which can either be restricted to the arm or involve the whole body. The aim of the present study was to investigate the role played by the sensorimotor context in eliciting one or the other of these two types of illusory movement. Whether the type of sensation experienced by the subjects depended on their adoption of an actively maintained or relaxed posture was examined. Analysis showed subjects' posture was certainly one of the factors involved: a rigidly held position favoured the occurrence of whole body sensations of movement, whereas a relaxed attitude favoured occurrence of arm-restricted sensations. This postural factor alone does not, however, account for the variations recorded in our experiment which seem to be related to the stimulus parameters as well as to individual factors.

Sign in / Sign up

Export Citation Format

Share Document