The purpose of this study was to shed light on cortical audiotactile integration and sensory substitution mechanisms, thought to serve as a basis for the use of a sensor glove in the preservation of the cortical map of the hand after peripheral nerve injuries. Fourteen subjects were selected and randomly assigned either to a training group, trained to replace touch for hearing with the use of a sensor glove, or to a control group, untrained. Training group volunteers had to identify textures just by the sound. In an fMRI experiment, all subjects received three types of stimuli: tactile only, combined audiotactile stimulation, and auditory only. Results indicate that, for trained subjects, a coupling between auditory and somatosensory cortical areas is established through associative areas. Differences in signal correlation between groups point to a pairing mechanism, which, at first, connects functionally the primary auditory and sensory areas (trained subjects). Later, this connection seems to be mediated by associative areas. The training with the sensor glove influences cortical audiotactile integration mechanisms, determining BOLD signal changes in the somatosensory area during auditory stimulation.
Objective: To develop a sensory glove model and test it in subjects with normal sensitivity in the upper limbs, who have been trained to replace hearing with touch. Methods: To make the equipment, a glove, mini-microphones, amplifier and headphones were used. Seven female subjects, with a mean age of 26.28 years (± 1.03) were selected to use the equipment and differentiate textures after training. The training took place over seven days, fifteen minutes a day, with the aim of identifying textures through sound, using the sensory glove. At the end all subjects answered a questionnaire. Results: All the subjects rated the use of the glove as "comfortable". Three subjects (42%) rated the aesthetic appearance of the equipment as "excellent", two subjects (28.57%) as "good", and two subjects (28.57%) as "regular." Six subjects (85.7%) identified the textures by sound alone, and one subject (14.3%) reported that he was aided by touch. Conclusion: It is feasible to manufacture a model of sensory glove using national technology that is readily accessible and relatively low cost, enabling the identification of textures through sound when the equipment is used by individuals trained to replace hearing with touch. Level of Evidence: Level II, prospective comparative study.
Uma paciente em pós-operatório de reparo das lesões dos tendões flexores e nervo digital do 5o dedo da mão direita foi estudada com o objetivo de avaliar os efeitos da aplicação de um protocolo de reeducação sensorial da mão. A paciente foi avaliada antes e após três meses da aplicação do protocolo. Nessas avaliações foram aplicados: teste de limiar de sensibilidade com monofilamentos, teste de discriminação de dois pontos estático e dinâmico, o questionário Dash (sigla em inglês de incapacidades de ombro, braço e mão) e testes de força de preensão palmar e de pinça. Os exercícios propostos envolveram: discriminação de toque estático e dinâmico e de objetos de diferentes formas, tamanhos e texturas. A paciente também foi orientada a executar programa domiciliar. Foi realizada a análise descritiva dos dados. Ao final dos três meses, verificou-se redução do limiar sensitivo na região volar do 5º dedo, bem como desenvolvimento de discriminação estática de dois pontos nessa região. Além disso, verificou-se aumento das forças de preensão palmar e de pinça e menor pontuação no questionário Dash. Os resultados sugerem que a aplicação de programas de reeducação da sensibilidade pode contribuir para a recuperação da função sensorial da mão, trazendo benefícios reais ao paciente.
Introduction: Early sensory re-education techniques are important strategies associated with cortical hand area preservation. The aim of this study was to investigate early cortical responses, sensory function outcomes and disability in patients treated with an early protocol of sensory re-education of the hand using an audio-tactile interaction device with a sensor glove model. Methods: After surgical repair of median and/or ulnar nerves, participants received either early sensory re-education twice a week with the sensor glove during three months or no specific sensory training. Both groups underwent standard rehabilitation. Patients were assessed at one, three and six months after surgery on training-related cortical responses by functional magnetic resonance imaging, sensory thresholds, discriminative touch and disability using the Disabilities of the Arm, Shoulder and Hand patient-reported questionnaire. Results: At six-months, there were no statistically significant differences in sensory function between groups. During functional magnetic resonance imaging, trained patients presented complex cortical responses to auditory stimulation indicating an effective connectivity between the cortical hand map and associative areas. Conclusion: Training with the sensor glove model seems to provide some type of early cortical audio-tactile interaction in patients with sensory impairment at the hand after nerve injury. Although no differences were observed between groups related to sensory function and disability at the intermediate phase of peripheral reinnervation, this study suggests that an early sensory intervention by sensory substitution could be an option to enhance the response on cortical reorganization after nerve repair in the hand. Longer follow-up and an adequately powered trial is needed to confirm our findings.
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