Stable Asymmetric Interhemispheric Theta Power in Patients With Anorexia Nervosa During Haptic Perception Even After Weight Gain: A Longitudinal Study

Grünwald, Martin; Weiß, Thomas; Assmann, Bianka; Ettrich, Christine

doi:10.1080/13803390409609785

Cited by 38 publications

(39 citation statements)

References 63 publications

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“…Sensory central and peripheral modifications may be associated with clinical manifestations. Grunwald 3,4 related changes in the right posterior parietal cortex, the same region of tactile perception, in patients with anorexia. Hands sensory function may be altered in a great variety of neurological disorders, e.g.…”

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“…Such interaction, which is not assessed by the Semmes-Weinstein protocol, allows the perception of objects (known as haptic perception, or stereognosis), which is achieved by the active exploration of surfaces, by moving hands 3,4 , and is fundamental in daily life activities. Therefore, tests involving haptic perception could include broader response scoring.…”

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“…) and the comparison between patients with sensory dysfunctions and healthy controls 1,3,4 . Younger children tend to hold objects for less time than older children, and to perform less rotations for tactile examination.…”

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Development of a new haptic perception instrument: a pilot study

Nascimento

Martini

Voos

et al. 2015

Arq. Neuro-Psiquiatr.

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Currently, therapists have difficulty assessing and describing hand sensory deficits. The gold-standard tool to quantify hand tactile sensitivity is the esthesiometer. The Semmes-Weinstein esthesiometer presents nylon monofilaments of approximately the same length and of varying diameters. The diameter and length are used to control the force applied. The minimal diameter detected is used to classify the sensory function 1 . However, not only tactile sensitivity, but also the ability to detect weight and compressibility variations are involved in hand function.The sensation of touch on skin is provided by mechanoreceptors in the epidermis and dermis skin layers. There are four types of mechanoreceptors: Merkel receptors detect pressure from small objects, on a frequency between 0.3 and 3.0 Hz. Meissner corpuscles detect flutter, e.g. when rubbing objects against the skin or skin movement across a surface, on a frequency between 3.0 to 40.0 Hz. Ruffini cylinders detect pressure and stretching of the skin, on higher frequencies, between 15.0 and 400.0 Hz 2 . Merkel disks and Ruffini cylinders are associated with slowly adapting fibers that respond as long as the stimulus is present. Meissner corpuscles respond to stimulation with a burst of firing at the beginning and end of stimulation, therefore, they are called rapidly adapting fibers AbstrACtObjective: Hand sensory tests do not consider distinct physiological receptors, nor detect normal range variations concerning developmental or pathological changes. We developed an instrument with a set of tests with timing and scoring for assessing haptic perception, which is the interaction between sensory and motor systems, in surfaces exploration, by moving hands. Method: Firstly, group meetings were set for test/manual conception and materials testing. The test/manual were submitted to 30 reviewers in 3 stages (10 reviewers on each stage). Results: The Hand Haptic Perception Instrument (HHPI) evaluates hand sensorimotor performance on six domains: depression, elevation, texture, compressibility, weight (barognosis) and form perception. Each domain requires specific materials. Score ranges from 0 to 57, being 0 the worst rating. Conclusion: This methodological process allowed the development of six domains and instructions to assess haptic perception. This version of HHPI is a pilot model. Further studies will determine reliability and normality ranges.Keywords: touch perception, form perception, weight perception, evaluation, hands. resumo Objetivo: Testes de sensibilidade manual não consideram receptores fisiológicos distintos, tampouco variações do desenvolvimento normal ou patológico. Desenvolvemos um instrumento, com pontuação e tempo de desempenho, para avaliar percepção háptica, que é a interação sensório-motora na exploração de superfícies, pelo movimento das mãos. Método: Reuniões de grupo foram estabelecidas para desenvolver os testes/manual e testar materiais. O instrumento e seu manual foram submetidos a 30 revisores, em 3 estágios (com 10 revisores em cad...

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Development of a new haptic perception instrument: a pilot study

Nascimento

Martini

Voos

et al. 2015

Arq. Neuro-Psiquiatr.

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“…O aumento do tamanho das peças também não foi aceito, pois precisamos de um padrão e escolhemos baseados na proposta de estruturas-teste produzidas por Grunwald 8,9 , com medidas de 13 x 13 cm.…”

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“…O aumento do tamanho das peças foi rejeitado, pois precisamos de um padrão e escolhemos baseados na literatura por Grunwald 8,9 , que propôs estruturas de 13 x 13 cm como adequadas para este tipo de avaliação.…”

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