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Katja Wiech - One of the best experts on this subject based on the ideXlab platform.
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Tactile discrimination but not Tactile Stimulation alone reduces chronic limb pain
2008Co-Authors: Lorimer G Moseley, Nadia Zalucki, Katja WiechAbstract:Chronic pain is often associated with reduced Tactile acuity. A relationship exists between pain intensity, Tactile acuity and cortical reorganisation. When pain resolves, Tactile function improves and cortical organisation normalises. Tactile acuity can be improved in healthy controls when Tactile Stimulation is associated with a behavioural objective. We hypothesised that, in patients with chronic limb pain and decreased Tactile acuity, discriminating between Tactile stimuli would decrease pain and increase Tactile acuity, but Tactile Stimulation alone would not. Thirteen patients with complex regional pain syndrome (CRPS) of one limb underwent a waiting period and then approximately 2 weeks of Tactile Stimulation under two conditions: Stimulation alone or discrimination between stimuli according to their diameter and location. There was no change in pain (100 mm VAS) or two-point discrimination (TPD) during a no-treatment waiting period, nor during the Stimulation phase (p > 0.32 for both). Pain and TPD were lower after the discrimination phase [mean (95% CI) effect size for pain VAS = 27 mm (14-40 mm) and for TPD = 5.7 mm (2.9-8. ), p < 0.015 for both]. These gains were maintained at three-month follow-up. We conclude that Tactile Stimulation can decrease pain and increase Tactile acuity when patients are required to discriminate between the type and location of Tactile stimuli.
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Tactile discrimination but not Tactile Stimulation alone reduces chronic limb pain
2008Co-Authors: Lorimer G Moseley, Nadia Zalucki, Katja WiechAbstract:Chronic pain is often associated with reduced Tactile acuity. A relationship exists between pain intensity, Tactile acuity and cortical reorganisation. When pain resolves, Tactile function improves and cortical organisation normalises. Tactile acuity can be improved in healthy controls when Tactile Stimulation is associated with a behavioural objective. We hypothesised that, in patients with chronic limb pain and decreased Tactile acuity, discriminating between Tactile stimuli would decrease pain and increase Tactile acuity, but Tactile Stimulation alone would not. Thirteen patients with complex regional pain syndrome (CRPS) of one limb underwent a waiting period and then 2 weeks of Tactile Stimulation under two conditions: Stimulation alone or discrimination between stimuli according to their diameter and location. There was no change in pain (100 mm VAS) or two-point discrimination (TPD) during a no-treatment waiting period, nor during the Stimulation phase (p > 0.32 for both). Pain and TPD were lower after the discrimination phase [mean (95% CI) effect size for pain VAS = 27 mm (14–40 mm) and for TPD = 5.7 mm (2.9–8.5 mm), p < 0.015 for both]. These gains were maintained at three-month follow-up. We conclude that Tactile Stimulation can decrease pain and increase Tactile acuity when patients are required to discriminate between the type and location of Tactile stimuli. � 2007 International Association for the Study of Pain. Published by Elsevier B.V. All rights reserved.
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Tactile discrimination but not Tactile Stimulation alone reduces chronic limb pain
2008Co-Authors: Lorimer G Moseley, Nadia Zalucki, Katja WiechAbstract:Chronic pain is often associated with reduced Tactile acuity. A relationship exists between pain intensity, Tactile acuity and cortical reorganisation. When pain resolves, Tactile function improves and cortical organisation normalises. Tactile acuity can be improved in healthy controls when Tactile Stimulation is associated with a behavioural objective. We hypothesised that, in patients with chronic limb pain and decreased Tactile acuity, discriminating between Tactile stimuli would decrease pain and increase Tactile acuity, but Tactile Stimulation alone would not. Thirteen patients with complex regional pain syndrome (CRPS) of one limb underwent a waiting period and then 2 weeks of Tactile Stimulation under two conditions: Stimulation alone or discrimination between stimuli according to their diameter and location. There was no change in pain (100 mm VAS) or two-point discrimination (TPD) during a no-treatment waiting period, nor during the Stimulation phase (p > 0.32 for both). Pain and TPD were lower after the discrimination phase [mean (95% CI) effect size for pain VAS = 27 mm (14–40 mm) and for TPD = 5.7 mm (2.9–8.5 mm), p < 0.015 for both]. These gains were maintained at three-month follow-up. We conclude that Tactile Stimulation can decrease pain and increase Tactile acuity when patients are required to discriminate between the type and location of Tactile stimuli. � 2007 International Association for the Study of Pain. Published by Elsevier B.V. All rights reserved.
Tomás Ortiz - One of the best experts on this subject based on the ideXlab platform.
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a n400 erp study in letter recognition after passive Tactile Stimulation training in blind children and sighted controls
2019Co-Authors: Tomás Ortiz, Laura Ortizteran, Agustin Turrero, Joaquin Pochbroto, Gabriel A De ErausquinAbstract:BACKGROUND: We previously demonstrated that using a sensory substitution device (SSD) for one week, Tactile Stimulation results in faster activation of lateral occipital complex in blind children than in seeing controls. OBJECTIVE: We used long-term haptic Tactile Stimulation training with an SSD to test if it results in stable cross-modal reassignment of visual pathways after six months, to provide high level processing of Tactile semantic content. METHODS: We enrolled 12 blind and 12 sighted children. The SSD transforms images to a Stimulation matrix in contact with the dominant hand. Subjects underwent twice-daily training sessions, 5 days/week for six months. Children were asked to describe line orientation, name letters, and read words. ERP sessions were performed at baseline and 6 months to analyze the N400 ERP component and reaction times (RT). N400 sources were estimated with Low Resolution Electromagnetic Tomography (LORETA). SPM8 was used to make population-level inferences. RESULTS: We found no group differences in RTs, accuracy of identifications, N400 latencies or distributions with the line task at 1 week or at 6 months. RTs on the letter recognition task were also similar. After 6 months, behavioral training increased accurate letter identification in both seeing and blind children (Chi 2 = 11906.934, p = 0.000), but the increase was larger in blind children (Chi 2 = 8.272, p = 0.004). Behavioral training shifted peak N400 amplitude to left occipital and bilateral parietal cortices in blind children, but to left precentral and postcentral and bilateral occipital cortices in sighted controls. CONCLUSIONS: Blind children learn to recognize SSD-delivered letters better than seeing controls and had greater N400 amplitude in the occipital region. To the best of our knowledge, our results provide the first published example of standard letter recognition (not Braille) by children with blindness using a Tactile delivery system.
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occipital cortex activation by long term repetitive Tactile Stimulation is necessary for object recognition in blinds a case report
2014Co-Authors: Tomás Ortiz, Laura Ortizteran, Gabriel A De Erausquin, Juan M Santos, Joaquín Poch, Carmen Requena, Juan A. Barcia, Ana M Martinez, Alvaro PascualleoneAbstract:Tactile vision has been approached from a variety of angles using different techniques. So far, a certain kind of object (and text) recognition has been shown, though seeing as such has not been achieved yet, and it remains unclear. Trough repetitive passive Tactile Stimulation perceptual processing is transferred from temporo-parietal to occipital areas, which affects object recognition. We report the results of passive Tactile Stimulation, as well as rTMS, applied to a 50 year old left handed blind male with over 97% loss of vision, who suffers from Peter's anomaly and microphthalmia. After 15 weeks of passive Tactile Stimulation, the subject showed increased activity in occipital areas associated with the development of visual-like perception which remained unchanged after three months without passive Tactile Stimulation. Inhibitory rTMS over the visual cortex led to noticeable reduction of spatial recognition performance and visual sensations in this subject. Stable changes in occipital cortical activity can be associated with subjective sensations of seeing. Once occipital activation has been achieved, it is necessary for spatial object recognition. Both facts highlight the implication of occipital areas in Tactile vision and the cortical plasticity of passive Tactile long-term Stimulation in people with blindness.
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Recruitment of Occipital Cortex during Sensory Substitution Training Linked to Subjective Experience of Seeing in People with Blindness
2011Co-Authors: Tomás Ortiz, Agustin Turrero, Juan M Santos, Joaquín Poch, Carmen Requena, Ana Martínez, Laura Ortiz-terán, Juan A. Barcia, Ramón Nogales, Agustín CalvoAbstract:Over three months of intensive training with a Tactile Stimulation device, 18 blind and 10 blindfolded seeing subjects improved in their ability to identify geometric figures by touch. Seven blind subjects spontaneously reported ‘visual qualia’, the subjective sensation of seeing flashes of light congruent with Tactile stimuli. In the latter subjects Tactile Stimulation evoked activation of occipital cortex on electroencephalography (EEG). None of the blind subjects who failed to experience visual qualia, despite identical Tactile Stimulation training, showed EEG recruitment of occipital cortex. None of the blindfolded seeing humans reported visual-like sensations during Tactile Stimulation. These findings support the notion that the conscious experience of seeing is linked to the activation of occipital brain regions in people with blindness. Moreover, the findings indicate that provision of visual information can be achieved through non-visual sensory modalities which may help to minimize the disability of blind individuals, affording them some degree of object recognition and navigation aid.
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recruitment of occipital cortex during sensory substitution training linked to subjective experience of seeing in people with blindness
2011Co-Authors: Tomás Ortiz, Laura Ortizteran, Agustin Turrero, Juan M Santos, Joaquín Poch, Carmen Requena, Juan A. Barcia, Ana M Martinez, Ramón NogalesAbstract:Over three months of intensive training with a Tactile Stimulation device, 18 blind and 10 blindfolded seeing subjects improved in their ability to identify geometric figures by touch. Seven blind subjects spontaneously reported ‘visual qualia’, the subjective sensation of seeing flashes of light congruent with Tactile stimuli. In the latter subjects Tactile Stimulation evoked activation of occipital cortex on electroencephalography (EEG). None of the blind subjects who failed to experience visual qualia, despite identical Tactile Stimulation training, showed EEG recruitment of occipital cortex. None of the blindfolded seeing humans reported visual-like sensations during Tactile Stimulation. These findings support the notion that the conscious experience of seeing is linked to the activation of occipital brain regions in people with blindness. Moreover, the findings indicate that provision of visual information can be achieved through non-visual sensory modalities which may help to minimize the disability of blind individuals, affording them some degree of object recognition and navigation aid.
Stephen J. Simpson - One of the best experts on this subject based on the ideXlab platform.
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Behavioural phase change in the Australian plague locust, Chortoicetes terminifera, is triggered by Tactile Stimulation of the antennae.
2010Co-Authors: Darron A. Cullen, Gregory A. Sword, Tim Dodgson, Stephen J. SimpsonAbstract:Density-dependent phase polyphenism is a defining characteristic of the paraphyletic group of acridid grasshoppers known as locusts. The cues and mechanisms associated with crowding that induce behavioural gregarization are best understood in the desert locust, Schistocerca gregaria, and involve a combination of sensory inputs from the head (visual and olfactory) and mechanoStimulation of the hind legs, acting via a transient increase in serotonin in the thoracic ganglia. Since behavioural gregarization has apparently arisen independently multiple times within the Acrididae, the important question arises as to whether the same mechanisms have been recruited each time. Here we explored the roles of visual, olfactory and Tactile Stimulation in the induction of behavioural gregarization in the Australian plague locust, Chortoicetes terminifera. We show that the primary gregarizing input is Tactile Stimulation of the antennae, with no evidence for an effect of visual and olfactory Stimulation or Tactile Stimulation of the hind legs. Our results show that convergent behavioural responses to crowding have evolved employing different sites of sensory input in the Australian plague locust and the desert locust.
Nadia Zalucki - One of the best experts on this subject based on the ideXlab platform.
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Tactile discrimination but not Tactile Stimulation alone reduces chronic limb pain
2008Co-Authors: Lorimer G Moseley, Nadia Zalucki, Katja WiechAbstract:Chronic pain is often associated with reduced Tactile acuity. A relationship exists between pain intensity, Tactile acuity and cortical reorganisation. When pain resolves, Tactile function improves and cortical organisation normalises. Tactile acuity can be improved in healthy controls when Tactile Stimulation is associated with a behavioural objective. We hypothesised that, in patients with chronic limb pain and decreased Tactile acuity, discriminating between Tactile stimuli would decrease pain and increase Tactile acuity, but Tactile Stimulation alone would not. Thirteen patients with complex regional pain syndrome (CRPS) of one limb underwent a waiting period and then approximately 2 weeks of Tactile Stimulation under two conditions: Stimulation alone or discrimination between stimuli according to their diameter and location. There was no change in pain (100 mm VAS) or two-point discrimination (TPD) during a no-treatment waiting period, nor during the Stimulation phase (p > 0.32 for both). Pain and TPD were lower after the discrimination phase [mean (95% CI) effect size for pain VAS = 27 mm (14-40 mm) and for TPD = 5.7 mm (2.9-8. ), p < 0.015 for both]. These gains were maintained at three-month follow-up. We conclude that Tactile Stimulation can decrease pain and increase Tactile acuity when patients are required to discriminate between the type and location of Tactile stimuli.
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Tactile discrimination but not Tactile Stimulation alone reduces chronic limb pain
2008Co-Authors: Lorimer G Moseley, Nadia Zalucki, Katja WiechAbstract:Chronic pain is often associated with reduced Tactile acuity. A relationship exists between pain intensity, Tactile acuity and cortical reorganisation. When pain resolves, Tactile function improves and cortical organisation normalises. Tactile acuity can be improved in healthy controls when Tactile Stimulation is associated with a behavioural objective. We hypothesised that, in patients with chronic limb pain and decreased Tactile acuity, discriminating between Tactile stimuli would decrease pain and increase Tactile acuity, but Tactile Stimulation alone would not. Thirteen patients with complex regional pain syndrome (CRPS) of one limb underwent a waiting period and then 2 weeks of Tactile Stimulation under two conditions: Stimulation alone or discrimination between stimuli according to their diameter and location. There was no change in pain (100 mm VAS) or two-point discrimination (TPD) during a no-treatment waiting period, nor during the Stimulation phase (p > 0.32 for both). Pain and TPD were lower after the discrimination phase [mean (95% CI) effect size for pain VAS = 27 mm (14–40 mm) and for TPD = 5.7 mm (2.9–8.5 mm), p < 0.015 for both]. These gains were maintained at three-month follow-up. We conclude that Tactile Stimulation can decrease pain and increase Tactile acuity when patients are required to discriminate between the type and location of Tactile stimuli. � 2007 International Association for the Study of Pain. Published by Elsevier B.V. All rights reserved.
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Tactile discrimination but not Tactile Stimulation alone reduces chronic limb pain
2008Co-Authors: Lorimer G Moseley, Nadia Zalucki, Katja WiechAbstract:Chronic pain is often associated with reduced Tactile acuity. A relationship exists between pain intensity, Tactile acuity and cortical reorganisation. When pain resolves, Tactile function improves and cortical organisation normalises. Tactile acuity can be improved in healthy controls when Tactile Stimulation is associated with a behavioural objective. We hypothesised that, in patients with chronic limb pain and decreased Tactile acuity, discriminating between Tactile stimuli would decrease pain and increase Tactile acuity, but Tactile Stimulation alone would not. Thirteen patients with complex regional pain syndrome (CRPS) of one limb underwent a waiting period and then 2 weeks of Tactile Stimulation under two conditions: Stimulation alone or discrimination between stimuli according to their diameter and location. There was no change in pain (100 mm VAS) or two-point discrimination (TPD) during a no-treatment waiting period, nor during the Stimulation phase (p > 0.32 for both). Pain and TPD were lower after the discrimination phase [mean (95% CI) effect size for pain VAS = 27 mm (14–40 mm) and for TPD = 5.7 mm (2.9–8.5 mm), p < 0.015 for both]. These gains were maintained at three-month follow-up. We conclude that Tactile Stimulation can decrease pain and increase Tactile acuity when patients are required to discriminate between the type and location of Tactile stimuli. � 2007 International Association for the Study of Pain. Published by Elsevier B.V. All rights reserved.
Fangang Zeng - One of the best experts on this subject based on the ideXlab platform.
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electro Tactile Stimulation enhances cochlear implant melody recognition effects of rhythm and musical training
2020Co-Authors: Juan Huang, Benjamin Sheffield, Fangang ZengAbstract:Author(s): Huang, Juan; Lu, Thomas; Sheffield, Benjamin; Zeng, Fan-Gang | Abstract: OBJECTIVES:Electro-acoustic Stimulation (EAS) enhances speech and music perception in cochlear-implant (CI) users who have residual low-frequency acoustic hearing. For CI users who do not have low-frequency acoustic hearing, Tactile Stimulation may be used in a similar fashion as residual low-frequency acoustic hearing to enhance CI performance. Previous studies showed that electro-Tactile Stimulation (ETS) enhanced speech recognition in noise and tonal language perception for CI listeners. Here, we examined the effect of ETS on melody recognition in both musician and nonmusician CI users. DESIGN:Nine musician and eight nonmusician CI users were tested in a melody recognition task with or without rhythmic cues in three testing conditions: CI only (E), Tactile only (T), and combined CI and Tactile Stimulation (ETS). RESULTS:Overall, the combined electrical and Tactile Stimulation enhanced the melody recognition performance in CI users by 9% points. Two additional findings were observed. First, musician CI users outperformed nonmusicians CI users in melody recognition, but the size of the enhancement effect was similar between the two groups. Second, the ETS enhancement was significantly higher with nonrhythmic melodies than rhythmic melodies in both groups. CONCLUSIONS:These findings suggest that, independent of musical experience, the size of the ETS enhancement depends on integration efficiency between Tactile and auditory Stimulation, and that the mechanism of the ETS enhancement is improved electric pitch perception. The present study supports the hypothesis that Tactile Stimulation can be used to improve pitch perception in CI users.
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electro Tactile Stimulation ets enhances cochlear implant mandarin tone recognition
2018Co-Authors: Juan Huang, Janice Chang, Fangang ZengAbstract:Abstract Objective Electro-acoustic Stimulation (EAS) is an effective method to enhance cochlear-implant performance in individuals who have residual low-frequency acoustic hearing. To help the majority of cochlear implant users who do not have any functional residual acoustic hearing, electro-Tactile Stimulation (ETS) may be used because Tactile sensation has a frequency range and perceptual capabilities similar to that produced by acoustic Stimulation in the EAS users. Methods Following up the first ETS study showing enhanced English sentence recognition in noise,1 the present study evaluated the effect of ETS on Mandarin tone recognition in noise in two groups of adult Mandarin-speaking individuals. The first group included 11 normal-hearing individuals who listened to a 4-channel, noise-vocoded, cochlear-implant simulation. The second group included 1 unilateral cochlear-implant user and 2 bilateral users with each of their devices being tested independently. Both groups participated in a 4-alternative, forced-choice task, in which they had to identify a tone that was presented in noise at a 0-dB signal-to-noise ratio via electric Stimulation (actual or simulated cochlear implants), Tactile Stimulation or the combined ETS. Results While electric or Tactile Stimulation alone produced similar tone recognition (∼40% correct), the ETS enhanced the cochlear-implant tone recognition by 17–18 percentage points. The size of the present ETS enhancement effect was similar to that of the previously reported EAS effect on Mandarin tone recognition. Psychophysical analysis on Tactile sensation showed an important role of frequency discrimination in the ETS enhancement. Conclusion Tactile Stimulation can potentially enhance Mandarin tone recognition in cochlear-implant users who do not have usable residual acoustic hearing. To optimize this potential, high fundamental frequencies need to be transposed to a 100–200 Hz range.
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electro Tactile Stimulation enhances cochlear implant speech recognition in noise
2017Co-Authors: Juan Huang, Benjamin Sheffield, Fangang ZengAbstract:For cochlear implant users, combined electro-acoustic Stimulation (EAS) significantly improves the performance. However, there are many more users who do not have any functional residual acoustic hearing at low frequencies. Because Tactile sensation also operates in the same low frequencies (<500 Hz) as the acoustic hearing in EAS, we propose electro-Tactile Stimulation (ETS) to improve cochlear implant performance. In ten cochlear implant users, a Tactile aid was applied to the index finger that converted voice fundamental frequency into Tactile vibrations. Speech recognition in noise was compared for cochlear implants alone and for the bimodal ETS condition. On average, ETS improved speech reception thresholds by 2.2 dB over cochlear implants alone. Nine of the ten subjects showed a positive ETS effect ranging from 0.3 to 7.0 dB, which was similar to the amount of the previously-reported EAS benefit. The comparable results indicate similar neural mechanisms that underlie both the ETS and EAS effects. The positive results suggest that the complementary auditory and Tactile modes also be used to enhance performance for normal hearing listeners and automatic speech recognition for machines.