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Author | Raveh, E.; Portnoy, S.; Friedman, J. | ||||
Title | Adding vibrotactile feedback to a myoelectric-controlled hand improves performance when online visual feedback is disturbed | Type | Journal Article | ||
Year | 2018 | Publication | Human Movement Science | Abbreviated Journal | Hum Mov Sci |
Volume | 58 | Issue | Pages | 32-40 | |
Keywords | Myoelectric prostheses; Sensorimotor control; Upper limb amputation; Visual feedback | ||||
Abstract | We investigated whether adding vibrotactile feedback to a myoelectric-controlled hand, when visual feedback is disturbed, can improve performance during a functional test. For this purpose, able-bodied subjects, activating a myoelectric-controlled hand attached to their right hand performed the modified Box & Blocks test, grasping and manipulating wooden blocks over a partition. This was performed in 3 conditions, using a repeated-measures design: in full light, in a dark room where visual feedback was disturbed and no auditory feedback – one time with the addition of tactile feedback provided during object grasping and manipulation, and one time without any tactile feedback. The average time needed to transfer one block was measured, and an infrared camera was used to give information on the number of grasping errors during performance of the test. Our results show that when vibrotactile feedback was provided, performance time was reduced significantly, compared with when no vibrotactile feedback was available. Furthermore, the accuracy of grasping and manipulation was improved, reflected by significantly fewer errors during test performance. In conclusion, adding vibrotactile feedback to a myoelectric-controlled hand has positive effects on functional performance when visual feedback is disturbed. This may have applications to current myoelectric-controlled hands, as adding tactile feedback may help prosthesis users to improve their functional ability during daily life activities in different environments, particularly when limited visual feedback is available or desirable. | ||||
Address | Physical Therapy Department, Sackler Faculty of Medicine, Tel Aviv University, Israel. Electronic address: jason@post.tau.ac.il | ||||
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Language | English | Summary Language | Original Title | ||
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ISSN | 0167-9457 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | PMID:29353091 | Approved | no | ||
Call Number | Serial | 88 | |||
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Author | Zacks, O.; Friedman, J. | ||||
Title | Analogies can speed up the motor learning process | Type | Journal Article | ||
Year | 2020 | Publication | Scientific Reports | Abbreviated Journal | Sci Rep |
Volume | 10 | Issue | 1 | Pages | 6932 |
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Abstract | Analogies have been shown to improve motor learning in various tasks and settings. In this study we tested whether applying analogies can shorten the motor learning process and induce insight and skill improvement in tasks that usually demand many hours of practice. Kinematic measures were used to quantify participant's skill and learning dynamics. For this purpose, we used a drawing task, in which subjects drew lines to connect dots, and a mirror game, in which subjects tracked a moving stimulus. After establishing a baseline, subjects were given an analogy, explicit instructions or no further instruction. We compared their improvement in skill (quantified by coarticulation or smoothness), accuracy and movement duration. Subjects in the analogy and explicit groups improved their coarticulation in the target task, while significant differences were found in the mirror game only at a slow movement frequency between analogy and controls.We conclude that a verbal analogy can be a useful tool for rapidly changing motor kinematics and movement strategy in some circumstances, although in the tasks selected it did not produce better performance in most measurements than explicit guidance. Furthermore, we observed that different movement facets may improve independently from others, and may be selectively affected by verbal instructions. These results suggest an important role for the type of instruction in motor learning. | ||||
Address | Dept. of Physical Therapy, Stanley Steyer School of Health Professions, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel | ||||
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Language | English | Summary Language | Original Title | ||
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Series Volume | Series Issue | Edition | |||
ISSN | 2045-2322 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | PMID:32332826; PMCID:PMC7181737 | Approved | no | ||
Call Number | Penn State @ write.to.jason @ | Serial | 105 | ||
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Author | Friedman, J.; Raveh, E.; Weiss, T.; Itkin, S.; Niv, D.; Hani, M.; Portnoy, S. | ||||
Title | Applying Incongruent Visual-Tactile Stimuli during Object Transfer with Vibro-Tactile Feedback | Type | |||
Year | 2019 | Publication | Journal of Visualized Experiments : JoVE | Abbreviated Journal | J Vis Exp |
Volume | 147 | Issue | Pages | e59493 | |
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Abstract | The application of incongruent sensory signals that involves disrupted tactile feedback is rarely explored, specifically with the presence of vibrotactile feedback (VTF). This protocol aims to test the effect of VTF on the response to incongruent visual-tactile stimuli. The tactile feedback is acquired by grasping a block and moving it across a partition. The visual feedback is a real-time virtual presentation of the moving block, acquired using a motion capture system. The congruent feedback is the reliable presentation of the movement of the block, so that the subject feels that the block is grasped and see it move along with the path of the hand. The incongruent feedback appears as the movement of the block diverts from the actual movement path, so that it seems to drop from the hand when it is actually still held by the subject, thereby contradicting the tactile feedback. Twenty subjects (age 30.2 +/- 16.3) repeated 16 block transfers, while their hand was hidden. These were repeated with VTF and without VTF (total of 32 block transfers). Incongruent stimuli were presented randomly twice within the 16 repetitions in each condition (with and without VTF). Each subject was asked to rate the difficulty level of performing the task with and without the VTF. There were no statistically significant differences in the length of the hand paths and durations between transfers recorded with congruent and incongruent visual-tactile signals – with and without the VTF. The perceived difficulty level of performing the task with the VTF significantly correlated with the normalized path length of the block with VTF (r = 0.675, p = 0.002). This setup is used to quantify the additive or reductive value of VTF during motor function that involves incongruent visual-tactile stimuli. Possible applications are prosthetics design, smart sport-wear, or any other garments that incorporate VTF. | ||||
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Language | English | Summary Language | Original Title | ||
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ISSN | 1940-087X | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | PMID:31180348 | Approved | no | ||
Call Number | Serial | 101 | |||
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Author | Ezrati, O.; Friedman, J.; Dar, R. | ||||
Title | Attenuation of access to internal states in high obsessive-compulsive individuals might increase susceptibility to false feedback: Evidence from a visuo-motor hand-reaching task | Type | Journal Article | ||
Year | 2019 | Publication | Journal of Behavior Therapy and Experimental Psychiatry | Abbreviated Journal | Journal of Behavior Therapy and Experimental Psychiatry |
Volume | 65 | Issue | Pages | 101445 | |
Keywords | Obsessive-compulsive disorder; Movement; Agency; Proprioception; Proxies | ||||
Abstract | Background and objectives The Seeking Proxies for Internal States (SPIS) model of obsessive-compulsive disorder (OCD) posits that obsessive-compulsive (OC) individuals have attenuated access to their internal states. Hence, they seek and rely on proxies, or discernible substitutes for these internal states. In previous studies, participants with high OC tendencies and OCD patients, compared to controls, showed increased reliance on external proxies and were more influenced by false feedback when judging their internal states. This study is the first to examine the effects of false feedback on performance of hand movements in participants with high and low OC tendencies. Method Thirty-four participants with high OC tendencies and 34 participants with low OC tendencies were asked to perform accurate hand reaches without visual feedback in two separate sessions of a computerized hand-reaching task: once after valid feedback training of their hand location and once with false-rotated feedback. We assessed the accuracy and directional adaptation of participants' reaches. Results As predicted, high OC participants evidenced a larger decrease in their hand positioning accuracy after training with false feedback compared to low OC participants. Limitations The generalization of our findings to OCD requires replication with a clinical sample. Conclusions These results suggest that in addition to self-perceptions, motor performance of OC individuals is prone to be overly influenced by false feedback, possibly due to attenuated access to proprioceptive cues. These findings may be particularly relevant to understanding the distorted sense of agency in OCD. |
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ISSN | 0005-7916 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | Approved | no | |||
Call Number | Serial | 95 | |||
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Author | Noy, L.; Alon, U.; Friedman, J. | ||||
Title | Corrective jitter motion shows similar individual frequencies for the arm and the finger | Type | Journal Article | ||
Year | 2015 | Publication | Experimental Brain Research | Abbreviated Journal | Exp Brain Res |
Volume | 233 | Issue | 4 | Pages | 1307-1320 |
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Abstract | A characteristic of visuomotor tracking of non-regular oscillating stimuli are high-frequency jittery corrective motions, oscillating around the tracked stimuli. However, the properties of these corrective jitter responses are not well understood. For example, does the jitter response show an idiosyncratic signature? What is the relationship between stimuli properties and jitter properties? Is the jitter response similar across effectors with different inertial properties? To answer these questions, we measured participants' jitter frequencies in two tracking tasks in the arm and the finger. Thirty participants tracked the same set of eleven non-regular oscillating stimuli, vertically moving on a screen, once with forward-backward arm movements (holding a tablet stylus) and once with upward-downward index finger movements (with a motion tracker attached). Participants' jitter frequencies and tracking errors varied systematically as a function of stimuli frequency and amplitude. Additionally, there were clear individual differences in average jitter frequencies between participants, ranging from 0.7 to 1.15 Hz, similar to values reported previously. A comparison of individual jitter frequencies in the two tasks showed a strong correlation between participants' jitter frequencies in the finger and the arm, despite the very different inertial properties of the two effectors. This result suggests that the corrective jitter response stems from common neural processes. | ||||
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Publisher | Place of Publication | Editor | |||
Language | English | Summary Language | Original Title | ||
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Series Volume | Series Issue | Edition | |||
ISSN | 0014-4819 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | PMID:25630905 | Approved | no | ||
Call Number | Serial | 76 | |||
Permanent link to this record |