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Author Raveh, E.; Friedman, J.; Portnoy, S. pdf  url
doi  openurl
  Title Visuomotor behaviors and performance in a dual-task paradigm with and without vibrotactile feedback when using a myoelectric controlled hand Type Journal Article
  Year 2018 Publication Assistive Technology Abbreviated Journal Assistive Technology  
  Volume 30 Issue Pages 274-280  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1040-0435 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number Serial 85  
Permanent link to this record
 

 
Author Awasthi, B.; Williams, M.A.; Friedman, J. pdf  url
doi  openurl
  Title Examining the role of red background in magnocellular contribution to face perception Type Journal Article
  Year 2016 Publication PeerJ Abbreviated Journal PeerJ  
  Volume 4 Issue Pages e1617  
  Keywords  
  Abstract This study examines the role of the magnocellular system in the early stages of face perception, in particular sex categorization. Utilizing the specific property of magnocellular suppression in red light, we investigated visually guided reaching to low and high spatial frequency hybrid faces against red and grey backgrounds. The arm movement curvature measure shows that reduced response of the magnocellular pathway interferes with the low spatial frequency component of face perception. This finding provides behavioral evidence for magnocellular contribution to non-emotional aspect of face perception.  
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  Language en Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 2167-8359 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number Serial 81  
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Author Ezrati, O.; Friedman, J.; Dar, R. pdf  url
doi  openurl
  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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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0005-7916 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number Serial 95  
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Author Lerner, O.; Friedman, J.; Frenkel-Toledo, S. pdf  url
doi  openurl
  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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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1743-0003 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number Serial 109  
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Author Dempsey-Jones, H.; Wesselink, D.B.; Friedman, J.; Makin, T.R. pdf  url
doi  openurl
  Title Organized Toe Maps in Extreme Foot Users Type Journal Article
  Year 2019 Publication Cell Reports Abbreviated Journal Cell Reports  
  Volume 28 Issue 11 Pages 2748-2756.e4  
  Keywords  
  Abstract Although the fine-grained features of topographic maps in the somatosensory cortex can be shaped by everyday experience, it is unknown whether behavior can support the expression of somatotopic maps where they do not typically occur. Unlike the fingers, represented in all primates, individuated toe maps have only been found in non-human primates. Using 1-mm resolution fMRI, we identify organized toe maps in two individuals born without either upper limb who use their feet to substitute missing hand function and even support their profession as foot artists. We demonstrate that the ordering and structure of the artists’ toe representation mimics typical hand representation. We further reveal “hand-like” features of activity patterns, not only in the foot area but also similarly in the missing hand area. We suggest humans may have an innate capacity for forming additional topographic maps that can be expressed with appropriate experience.  
  Address  
  Corporate Author Thesis  
  Publisher Elsevier Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 2211-1247 ISBN Medium  
  Area Expedition Conference  
  Notes doi: 10.1016/j.celrep.2019.08.027 Approved no  
  Call Number Serial 99  
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