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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 | Cantergi, D.; Awasthi, B.; Friedman, J. | ||||
| Title | Moving objects by imagination? Amount of finger movement and pendulum length determine success in the Chevreul pendulum illusion | Type | Journal Article | ||
| Year | 2021 | Publication | Human Movement Science | Abbreviated Journal | Human Movement Science |
| Volume | 80 | Issue | Pages | 102879 | |
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| ISSN | 0167-9457 | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | Serial | 111 | |||
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| Author | Mimouni-Bloch, A.; Shaklai, S.; Levin, M.; Ingber, M.; Karolitsky, T.; Grunbaum, S.; Friedman, J. | ||||
| Title | Developmental and acquired brain injury have opposite effects on finger coordination in children | Type | Journal Article | ||
| Year | 2023 | Publication | Frontiers in Human Neuroscience | Abbreviated Journal | Front. Hum. Neurosci. |
| Volume | 17 | Issue | Pages | 1083304 | |
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| ISSN | 1662-5161 | ISBN | Medium | ||
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| Call Number | Serial | 119 | |||
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| Author | Frenkel-Toledo, S.; Levin, M.F.; Berman, S.; Liebermann, D.G.; Baniña, M.C.; Solomon, J.M.; Ofir-Geva, S.; Soroker, N. | ||||
| Title | Shared and distinct voxel-based lesion-symptom mappings for spasticity and impaired movement in the hemiparetic upper limb | Type | Journal Article | ||
| Year | 2022 | Publication | Scientific Reports | Abbreviated Journal | Sci Rep |
| Volume | 12 | Issue | 1 | Pages | |
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| ISSN | 2045-2322 | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | Serial | 113 | |||
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| Author | Swissa, Y.; Hacohen, S.; Friedman, J.; Frenkel-Toledo, S. | ||||
| Title | Sensorimotor performance after high-definition transcranial direct current stimulation over the primary somatosensory or motor cortices in men versus women | Type | Journal Article | ||
| Year | 2022 | Publication | Scientific Reports | Abbreviated Journal | Sci Rep |
| Volume | 12 | Issue | Pages | 11117 | |
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| Abstract | The primary somatosensory (S1) cortex is a central structure in motor performance. However, transcranial direct current stimulation (tDCS) research aimed at improving motor performance usually targets the primary motor cortex (M1). Recently, sex was found to mediate tDCS response. Thus, we investigated whether tDCS with an anodal electrode placed over S1 improves motor performance and sensation perception in men versus women. Forty-five participants randomly received 15-min high-definition tDCS (HD-tDCS) at 1 mA to S1, M1, or sham stimulation. Reaching performance was tested before and immediately following stimulation. Two-point orientation discrimination (TPOD) of fingers and proprioception of a reaching movement were also tested. Although motor performance did not differ between groups, reaching reaction time improved in the M1 group men. Reaching movement time and endpoint error improved in women and men, respectively. Correct trials percentage for TPOD task was higher in the S1 compared to the M1 group in the posttest and improved only in the S1 group. Reaching movement time for the proprioception task improved, overall, and endpoint error did not change. Despite the reciprocal connections between S1 and M1, effects of active tDCS over S1 and M1 may specifically influence sensation perception and motor performance, respectively. Also, sex may mediate effects of HD-tDCS on motor performance. | ||||
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| ISSN | 2045-2322 | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | Serial | 114 | |||
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