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Kent RD. The Feel of Speech: Multisystem and Polymodal Somatosensation in Speech Production. JOURNAL OF SPEECH, LANGUAGE, AND HEARING RESEARCH : JSLHR 2024; 67:1424-1460. [PMID: 38593006 DOI: 10.1044/2024_jslhr-23-00575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2024]
Abstract
PURPOSE The oral structures such as the tongue and lips have remarkable somatosensory capacities, but understanding the roles of somatosensation in speech production requires a more comprehensive knowledge of somatosensation in the speech production system in its entirety, including the respiratory, laryngeal, and supralaryngeal subsystems. This review was conducted to summarize the system-wide somatosensory information available for speech production. METHOD The search was conducted with PubMed/Medline and Google Scholar for articles published until November 2023. Numerous search terms were used in conducting the review, which covered the topics of psychophysics, basic and clinical behavioral research, neuroanatomy, and neuroscience. RESULTS AND CONCLUSIONS The current understanding of speech somatosensation rests primarily on the two pillars of psychophysics and neuroscience. The confluence of polymodal afferent streams supports the development, maintenance, and refinement of speech production. Receptors are both canonical and noncanonical, with the latter occurring especially in the muscles innervated by the facial nerve. Somatosensory representation in the cortex is disproportionately large and provides for sensory interactions. Speech somatosensory function is robust over the lifespan, with possible declines in advanced aging. The understanding of somatosensation in speech disorders is largely disconnected from research and theory on speech production. A speech somatoscape is proposed as the generalized, system-wide sensation of speech production, with implications for speech development, speech motor control, and speech disorders.
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Endicott RP. Inner speech and the body error theory. Front Psychol 2024; 15:1360699. [PMID: 38577120 PMCID: PMC10991815 DOI: 10.3389/fpsyg.2024.1360699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2023] [Accepted: 02/27/2024] [Indexed: 04/06/2024] Open
Abstract
Inner speech is commonly understood as the conscious experience of a voice within the mind. One recurrent theme in the scientific literature is that the phenomenon involves a representation of overt speech, for example, a representation of phonetic properties that result from a copy of speech instructions that were ultimately suppressed. I propose a larger picture that involves some embodied objects and their misperception. I call it "the Body Error Theory," or BET for short. BET is a form of illusionism, but the particular version I favor is a cross-modal illusion. Newly described here, my hypothesis is that the experience of inner speech arises from a mix of interoception and audition. Specifically, there is the detection of slight but well-confirmed activities in the speech musculature that occur during inner speech, which helps to transform representations of normal but quiet nonverbal sounds that inevitably occur during inner speech, from breathing to background noise, into a mistaken perception of inner speech. Simply put, activities in the speech musculature mix with sounds to create the appearance of speech sounds, which thus explains the "voice within the mind." I also show how BET's cross-modal system fits with standard information processing accounts for speech monitoring and how it accommodates the central insights of leading theories of inner speech. In addition, I show how BET is supported by data from experience-sampling surveys and how it can be empirically tested against its rivals.
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Affiliation(s)
- Ronald P. Endicott
- Department of Philosophy and Religious Studies, Cognitive Science, North Carolina State University, Raleigh, NC, United States
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Allison TS, Moritz J, Turk P, Stone-Roy LM. Lingual electrotactile discrimination ability is associated with the presence of specific connective tissue structures (papillae) on the tongue surface. PLoS One 2020; 15:e0237142. [PMID: 32764778 PMCID: PMC7413419 DOI: 10.1371/journal.pone.0237142] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Accepted: 07/21/2020] [Indexed: 11/19/2022] Open
Abstract
Electrical stimulation of nerve endings in the tongue can be used to communicate information to users and has been shown to be highly effective in sensory substitution applications. The anterior tip of the tongue has very small somatosensory receptive fields, comparable to those of the finger tips, allowing for precise two-point discrimination and high tactile sensitivity. However, perception of electrotactile stimuli varies significantly between users, and across the tongue surface. Despite this, previous studies all used uniform electrode grids to stimulate a region of the dorsal-medial tongue surface. In an effort to customize electrode layouts for individual users, and thus improve efficacy for sensory substitution applications, we investigated whether specific neuroanatomical and physiological features of the tongue are associated with enhanced ability to perceive active electrodes. Specifically, the study described here was designed to test whether fungiform papillae density and/or propylthiouracil sensitivity are positively or negatively associated with perceived intensity and/or discrimination ability for lingual electrotactile stimuli. Fungiform papillae number and distribution were determined for 15 participants and they were exposed to patterns of electrotactile stimulation (ETS) and asked to report perceived intensity and perceived number of stimuli. Fungiform papillae number and distribution were then compared to ETS characteristics using comprehensive and rigorous statistical analyses. Our results indicate that fungiform papillae density is correlated with enhanced discrimination ability for electrical stimuli. In contrast, papillae density, on average, is not correlated with perceived intensity of active electrodes. However, results for at least one participant suggest that further research is warranted. Our data indicate that propylthiouracil taster status is not related to ETS perceived intensity or discrimination ability. These data indicate that individuals with higher fungiform papillae number and density in the anterior medial tongue region may be better able to use lingual ETS for sensory substitution.
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Affiliation(s)
- Tyler S. Allison
- Department of Biomedical Sciences, Colorado State University, Fort Collins, Colorado, United States of America
| | - Joel Moritz
- Department of Mechanical Engineering, Colorado State University, Fort Collins, Colorado, United States of America
- Sapien LLC, Fort Collins, Colorado, United States of America
| | - Philip Turk
- Department of Statistics, Colorado State University, Fort Collins, Colorado, United States of America
| | - Leslie M. Stone-Roy
- Department of Biomedical Sciences, Colorado State University, Fort Collins, Colorado, United States of America
- * E-mail:
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Pais Clemente M, Pinto A, Milheiro F, Costa TF, Moreira A, Vardasca R, Pereira PA, Mendes J, Dulce Madeira M, Manuel Amarante J. Adhesive dentistry sensory stimulus technique as a neuromechanism for the treatment of orofacial pain associated to temporomandibular disorders: Case study. J Oral Biol Craniofac Res 2020; 10:6-12. [PMID: 32025480 DOI: 10.1016/j.jobcr.2020.01.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Accepted: 01/14/2020] [Indexed: 11/15/2022] Open
Abstract
Purpose The authors intend, by presenting a case study, emphasize the neuromodulation process of orofacial pain induced by the stimulation of the sensory and motor stimulation of the trigeminal nerve, which can play an important role on pain modulation. Materials and methods A 25 year-old woman presenting orofacial pain was referred to the stomatology service at the Centro Hospitalar do Porto. After collecting the patient's anamnesis, the thermographic camera FLIR i7 was used to record the thermal status of the orofacial structures, before the adhesive dentistry sensory stimulus protocol, after 45 minutes, and after one week. Results This study suggests the relation of adhesive dentistry sensory stimulus technique in the neuromodulation of orofacial pain and its association with the temporomandibular disorders . As the tongue senses the stimulus of the resin composite placed on the palatal surface of the 1st premolar, 2nd premolar and 1st molar of the maxilla, this can promote and induce an effect regarding a peripheral nerve neuromodulation resulting in a blockage of the nociceptive trigeminal pathway from temporomandibular disorders. Conclusion Orofacial pain is a common complaint among the patients that come to a dentistry appointment, which may have different diagnosis and treatments. A positive effect on the patient's symptomatology was confirmed clinically on subsequent dental appointments and monitored by infrared thermography.
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Affiliation(s)
- Miguel Pais Clemente
- Department of Surgery and Physiology, Faculty of Medicine, University of Porto, Portugal
| | - Asdrúbal Pinto
- Serviço de Estomatologia e Cirurgia Maxilo Facial, Centro Hospitalar do Porto, Portugal
| | - Fernando Milheiro
- Serviço de Estomatologia e Cirurgia Maxilo Facial, Centro Hospitalar do Porto, Portugal
| | - Teresa F Costa
- Faculty of Dental Medicine, University of Porto, Porto, Portugal
| | - Andre Moreira
- Faculty of Dental Medicine, University of Porto, Porto, Portugal
| | - Ricardo Vardasca
- Faculty of Engineering, University of Porto, Portugal.,Labiomep, University of Porto, Portugal
| | - Pedro A Pereira
- Unit of Anatomy, Department of Biomedicine, Faculty of Medicine, University of Porto, Portugal.,CINTESIS - Centro de Investigação em Tecnologias e Serviços de Saúde, Porto, Portugal
| | - Joaquim Mendes
- Faculty of Engineering, University of Porto, Portugal.,Labiomep, University of Porto, Portugal.,INEGI, Porto, Portugal
| | - M Dulce Madeira
- Unit of Anatomy, Department of Biomedicine, Faculty of Medicine, University of Porto, Portugal.,CINTESIS - Centro de Investigação em Tecnologias e Serviços de Saúde, Porto, Portugal
| | - José Manuel Amarante
- Department of Surgery and Physiology, Faculty of Medicine, University of Porto, Portugal.,Labiomep, University of Porto, Portugal
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Bordoni B, Morabito B, Mitrano R, Simonelli M, Toccafondi A. The Anatomical Relationships of the Tongue with the Body System. Cureus 2018; 10:e3695. [PMID: 30838167 PMCID: PMC6390887 DOI: 10.7759/cureus.3695] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
The tongue plays a fundamental role in several body functions such as swallowing, breathing, speaking, and chewing. Its action is not confined to the oral cavity, but it affects lower limb muscle strength and posture. The tongue is an organ that has an autocrine/paracrine mechanism of action to synthesize different substances to interact with the whole body; according to a line of thought, it is also an extension of the enteric system. The aim of this study was to review the functions of the tongue and its anatomical association with the body system. According to the authors' knowledge, this is the first scientific article focusing on the tongue in a systemic context. In a clinical evaluation, connections with the tongue should be considered to optimize the clinical examination of the tongue and therefore enhance rehabilitation programs and therapeutic results.
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Affiliation(s)
- Bruno Bordoni
- Cardiology, Foundation Don Carlo Gnocchi / Institute of Hospitalization and Care, Milan, ITA
| | - Bruno Morabito
- Osteopathy, School of Osteopathic Centre for Research and Studies, Milan, ITA
| | - Roberto Mitrano
- Cardiology, Foundation Don Carlo Gnocchi/institute of Hospitalization and Care, Milan, ITA
| | | | - Anastasia Toccafondi
- Cardiology, Foundation Don Carlo Gnocchi/institute of Hospitalization and Care, Milan, ITA
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Maezawa H. Cortical Mechanisms of Tongue Sensorimotor Functions in Humans: A Review of the Magnetoencephalography Approach. Front Hum Neurosci 2017; 11:134. [PMID: 28400725 PMCID: PMC5368248 DOI: 10.3389/fnhum.2017.00134] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2017] [Accepted: 03/08/2017] [Indexed: 11/13/2022] Open
Abstract
The tongue plays important roles in a variety of critical human oral functions, including speech production, swallowing, mastication and respiration. These sophisticated tongue movements are in part finely regulated by cortical entrainment. Many studies have examined sensorimotor processing in the limbs using magnetoencephalography (MEG), which has high spatiotemporal resolution. Such studies have employed multiple methods of analysis, including somatosensory evoked fields (SEFs), movement-related cortical fields (MRCFs), event-related desynchronization/synchronization (ERD/ERS) associated with somatosensory stimulation or movement and cortico-muscular coherence (CMC) during sustained movement. However, the cortical mechanisms underlying the sensorimotor functions of the tongue remain unclear, as contamination artifacts induced by stimulation and/or muscle activity within the orofacial region complicates MEG analysis in the oral region. Recently, several studies have obtained MEG recordings from the tongue region using improved stimulation methods and movement tasks. In the present review, we provide a detailed overview of tongue sensorimotor processing in humans, based on the findings of recent MEG studies. In addition, we review the clinical applications of MEG for sensory disturbances of the tongue caused by damage to the lingual nerve. Increased knowledge of the physiological and pathophysiological mechanisms underlying tongue sensorimotor processing may improve our understanding of the cortical entrainment of human oral functions.
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Affiliation(s)
- Hitoshi Maezawa
- Department of Oral Physiology, Graduate School of Dental Medicine, Hokkaido University Sapporo, Japan
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Kothari M, Liu X, Baad-Hansen L, Kumar A, Bin G, Svensson P. Influence of visual observational conditions on tongue motor learning. Eur J Oral Sci 2016; 124:534-539. [DOI: 10.1111/eos.12299] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/05/2016] [Indexed: 12/31/2022]
Affiliation(s)
- Mohit Kothari
- Hammel Neurorehabilitation Centre and University Research Clinic; Aarhus University; Hammel Denmark
| | - Xuemei Liu
- Department of Stomatology; Chinese PLA General Hospital; Beijing China
| | - Lene Baad-Hansen
- Section of Orofacial Pain and Jaw Function; Institute of Odontology and Oral Health; Aarhus University; Aarhus Denmark
- Scandinavian Center for Orofacial Neurosciences (SCON); Aarhus Denmark
| | - Abhishek Kumar
- Scandinavian Center for Orofacial Neurosciences (SCON); Aarhus Denmark
- Section of Oral Rehabilitation; Department of Dental Medicine; Karolinska Institute; Huddinge Sweden
| | - Guo Bin
- Department of Stomatology; Chinese PLA General Hospital; Beijing China
| | - Peter Svensson
- Section of Orofacial Pain and Jaw Function; Institute of Odontology and Oral Health; Aarhus University; Aarhus Denmark
- Scandinavian Center for Orofacial Neurosciences (SCON); Aarhus Denmark
- Section of Oral Rehabilitation; Department of Dental Medicine; Karolinska Institute; Huddinge Sweden
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Oral somatosensory awareness. Neurosci Biobehav Rev 2014; 47:469-84. [DOI: 10.1016/j.neubiorev.2014.09.015] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Revised: 09/03/2014] [Accepted: 09/10/2014] [Indexed: 12/19/2022]
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