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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 | ||
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| Notes | Approved | no | |||
| Call Number | Serial | 95 | |||
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| Author | Kaufman-Cohen, Y.; Levanon, Y.; Friedman, J.; Yaniv, Y.; Portnoy, S. | ||||
| Title | Home exercise in the dart-throwing motion plane after distal radius fractures: A Pilot Randomized Controlled Trial | Type | Journal Article | ||
| Year | 2020 | Publication |
Journal of Hand Therapy | Abbreviated Journal | |
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| Notes | Approved | no | |||
| Call Number | Serial | 103 | |||
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| Author | Kaufman-Cohen, Y.; Portnoy, S.; Levanon, Y.; Friedman, J. | ||||
| Title | Does Object Height Affect the Dart Throwing Motion Angle during Seated Activities of Daily Living? | Type | Journal Article | ||
| Year | 2019 | Publication |
Journal of Motor Behavior | Abbreviated Journal | J Mot Behav |
| Volume | Issue | Pages | 1-10 | ||
| Keywords | dart throwing motion (DTM); heights; kinematics; seated activities of daily living (ADL); upper extremity; wrist rehabilitation | ||||
| Abstract | Complex wrist motions are needed to complete various daily activities. Analyzing the multidimensional motion of the wrist is crucial for understanding our functional movement. Several studies have shown that numerous activities of daily livings (ADLs) are performed using an oblique plane of wrist motion from radial-extension to ulnar-flexion, named the Dart Throwing Motion (DTM) plane. To the best of our knowledge, the DTM plane angle performed during ADLs has not been compared between different heights (e.g. table, shoulder and head height), as is common when performing day-to-day tasks. In this study, we compared DTM plane angles when performing different ADLs at three different heights and examined the relationship between DTM plane angles and limb position. We found that height had a significant effect on the DTM plane angles – the mean DTM plane angle was greater at the lower level compared to the mid and higher levels. A significant effect of shoulder orientation on mean DTM plane angles was shown in the sagittal and coronal planes. Our findings support the importance of training daily tasks at different heights during rehabilitation following wrist injuries, in order to explore a large range of DTM angles, to accommodate needs of common ADLs. | ||||
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| Language | English | Summary Language | Original Title | ||
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| ISSN | 0022-2895 | ISBN | Medium | ||
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| Notes | PMID:31359843 | Approved | no | ||
| Call Number | Serial | 100 | |||
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| Author | Lackritz, H.; Parmet, Y.; Frenkel-Toledo, S.; Banina, M.C.; Soroker, N.; Solomon, J.M.; Liebermann, D.G.; Levin, M.F.; Berman, S. | ||||
| Title | Effect of post-stroke spasticity on voluntary movement of the upper limb | Type | Journal Article | ||
| Year | 2021 | Publication |
Journal of Neuroengineering and Rehabilitation | Abbreviated Journal | J Neuroeng Rehabil |
| Volume | 18 | Issue | 1 | Pages | 81 |
| Keywords | Gaussian mixture model; Hellinger's distance; Hemiparesis; Kinematics; Kullback-Liebler divergence; Spasticity; Stochastic model; Stroke | ||||
| Abstract | BACKGROUND: Hemiparesis following stroke is often accompanied by spasticity. Spasticity is one factor among the multiple components of the upper motor neuron syndrome that contributes to movement impairment. However, the specific contribution of spasticity is difficult to isolate and quantify. We propose a new method of quantification and evaluation of the impact of spasticity on the quality of movement following stroke. METHODS: Spasticity was assessed using the Tonic Stretch Reflex Threshold (TSRT). TSRT was analyzed in relation to stochastic models of motion to quantify the deviation of the hemiparetic upper limb motion from the normal motion patterns during a reaching task. Specifically, we assessed the impact of spasticity in the elbow flexors on reaching motion patterns using two distinct measures of the 'distance' between pathological and normal movement, (a) the bidirectional Kullback-Liebler divergence (BKLD) and (b) Hellinger's distance (HD). These measures differ in their sensitivity to different confounding variables. Motor impairment was assessed clinically by the Fugl-Meyer assessment scale for the upper extremity (FMA-UE). Forty-two first-event stroke patients in the subacute phase and 13 healthy controls of similar age participated in the study. Elbow motion was analyzed in the context of repeated reach-to-grasp movements towards four differently located targets. Log-BKLD and HD along with movement time, final elbow extension angle, mean elbow velocity, peak elbow velocity, and the number of velocity peaks of the elbow motion were computed. RESULTS: Upper limb kinematics in patients with lower FMA-UE scores (greater impairment) showed greater deviation from normality when the distance between impaired and normal elbow motion was analyzed either with the BKLD or HD measures. The severity of spasticity, reflected by the TSRT, was related to the distance between impaired and normal elbow motion analyzed with either distance measure. Mean elbow velocity differed between targets, however HD was not sensitive to target location. This may point at effects of spasticity on motion quality that go beyond effects on velocity. CONCLUSIONS: The two methods for analyzing pathological movement post-stroke provide new options for studying the relationship between spasticity and movement quality under different spatiotemporal constraints. | ||||
| Address | The Zlotowski Center, Ben-Gurion University of the Negev, Beer-Sheva, Israel. sigalbe@bgu.ac.il | ||||
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| ISSN | 1743-0003 | ISBN | Medium | ||
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| Notes | PMID:33985543 | Approved | no | ||
| Call Number | Serial | 108 | |||
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| Author | Lerner, O.; Friedman, J.; Frenkel-Toledo, S. | ||||
| Title | The effect of high-definition transcranial direct current stimulation intensity on motor performance in healthy adults: a randomized controlled trial | Type | Journal Article | ||
| Year | 2021 | Publication |
Journal of NeuroEngineering and Rehabilitation | Abbreviated Journal | J NeuroEngineering Rehabil |
| Volume | 18 | Issue | Pages | 103 | |
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| ISSN | 1743-0003 | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | Serial | 109 | |||
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