Posts Tagged Simulation

[VIDEO] How to simulate HH – YouTube

Quick and easy simulation of homonymous hemianopia/homonymous hemianopsia. Great to show loved ones and caregivers the dramatic nature of stroke related visual field loss.

via How to simulate HH – YouTube

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[Abstract] Design and Analysis of a Cable-Driven Articulated Rehabilitation System for Gait Training – ASME

Abstract

Assisted motor therapies play a critical role in enhancing functional musculoskeletal recovery and neurological rehabilitation. Our long term goal is to assist and automate the performance of repetitive motor-therapy of the human lower limbs. Hence, in this paper, we examine the viability of a light-weight and reconfigurable hybrid (articulated-multibody and cable) robotic system for assisting lower-extremity rehabilitation and analyze its performance. A hybrid cable-actuated articulated multibody system is formed when multiple cables are attached from a ground-frame to various locations on an articulated-linkage based orthosis. Our efforts initially focus on developing an analysis and simulation framework for the kinematics and dynamics of the cable-driven lower limb orthosis. A Monte Carlo approach is employed to select configuration parameters including cuff sizes, cuff locations, and the position of fixed winches. The desired motions for the rehabilitative exercises are prescribed based upon motion patterns from a normative subject cohort. We examine the viability of using two controllers — a joint-space feedback linearized PD controller and a task-space force-control strategy — to realize trajectory- and path- tracking of the desired motions within a simulation environment. In particular, we examine performance in terms of (i) coordinated control of the redundant system; (ii) reducing internal stresses within the lower-extremity joints; and (iii) continued satisfaction of the unilateral cable-tension constraints throughout the workspace.

Source: Article

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[ARTICLE] Organizing motor imageries – Full Text

Highlights

  • Motor imagery is widely defined as mental rehearsal of movement.
  • Here, motor imagery is characterized based on four different factors.
  • Previous motor imagery studies can be re-interpreted using these four factors.

Abstract

Over the last few decades, motor imagery has attracted the attention of researchers as a prototypical example of ‘embodied cognition’ and also as a basis for neuro-rehabilitation and brain–machine interfaces. The current definition of motor imagery is widely accepted, but it is important to note that various abilities rather than a single cognitive entity are dealt with under a single term. Here, motor imagery has been characterized based on four factors:

  1. motor control
  2. explicitness,
  3. sensory modalities
  4. agency.

Sorting out these factors characterizing motor imagery may explain some discrepancies and variability in the findings from previous studies and will help to optimize a study design in accordance with the purpose of each study in the future.

Somatotopically arranged brain activity during mental rotation (MR) of hands and ...

Somatotopically arranged brain activity during mental rotation (MR) of hands and feet (Hanakawa et al., 2007). Activity greater for the foot MR than for the hand MR (green) is situated dorsal to activity greater for the hand MR than for the foot MR (red). This arrangement agrees with the motor somatotopy of the motor and somatosensory areas where the foot representations are situated dorsal to the hand representations. Primary motor cortex (M1), primary somatosensory cortex (S1), dorsal premotor cortex (PMd), supplementary motor cortex (SMA).

Continue —> Organizing motor imageries

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