Speech science

Speech science refers to the study of production, transmission and perception of speech. Speech science involves anatomy, in particular the anatomy of the oro-facial region and neuroanatomy, physiology, and acoustics. Speech science refers to the study of production, transmission and perception of speech. Speech science involves anatomy, in particular the anatomy of the oro-facial region and neuroanatomy, physiology, and acoustics. The production of speech is a highly complex motor task that involves approximately 100 orofacial, laryngeal, pharyngeal, and respiratory muscles. Precise and expeditious timing of these muscles is essential for the production of temporally complex speech sounds, which are characterized by transitions as short as 10 ms between frequency bands and an average speaking rate of approximately 15 sounds per second. Speech production requires airflow from the lungs (respiration) to be phonated through the vocal folds of the larynx (phonation) and resonated in the vocal cavities shaped by the jaw, soft palate, lips, tongue and other articulators (articulation). Respiration is the physical process of gas exchange between an organism and its environment involving four steps (ventilation, distribution, perfusion and diffusion) and two processes (inspiration and expiration). Respiration can be described as the mechanical process of air flowing into and out of the lungs on the principle of Boyle's law, stating that, as the volume of a container increases, the air pressure will decrease. This relatively negative pressure will cause air to enter the container until the pressure is equalized. During inspiration of air, the diaphragm contracts and the lungs expand drawn by pleurae through surface tension and negative pressure. When the lungs expand, air pressure becomes negative compared to atmospheric pressure and air will flow from the area of higher pressure to fill the lungs. Forced inspiration for speech uses accessory muscles to elevate the rib cage and enlarge the thoracic cavity in the vertical and lateral dimensions. During forced expiration for speech, muscles of the trunk and abdomen reduce the size of the thoracic cavity by compressing the abdomen or pulling the rib cage down forcing air out of the lungs. Phonation is the production of a periodic sound wave by vibration of the vocal folds. Airflow from the lungs, as well as laryngeal muscle contraction, causes movement of the vocal folds. It is the properties of tension and elasticity that allow the vocal folds to be stretched, bunched, brought together and separated. During prephonation, the vocal folds move from the abducted to adducted position. Subglottal pressure builds and air flow forces the folds apart, inferiorly to superiorly. If the volume of airflow is constant, the velocity of the flow will increase at the area of constriction and cause a decrease in pressure below once distributed. This negative pressure will pull the initially blow open folds back together again. The cycle repeats until the vocal folds are abducted to inhibit phonation or to take a breath. In a third process of speech production, articulation, mobile and immobile structures of the face (articulators) adjust the shape of the mouth, pharynx and nasal cavities (vocal tract) as the vocal fold vibration sound passes through producing varying resonant frequencies. The analysis of brain lesions and the correlation between lesion locations and behavioral deficits were the most important sources of knowledge about the cerebral mechanisms underlying speech production for many years. The seminal lesion studies of Paul Broca indicated that the production of speech relies on the functional integrity of the left inferior frontal gyrus. More recently, the results of noninvasive neuroimaging techniques, such as functional magnetic resonance imaging (fMRI), provide growing evidence that complex human skills are not primarily located in highly specialized brain areas (e.g., Broca's area) but are organized in networks connecting several different areas of both hemispheres instead. Functional neuroimaging identified a complex neural network underlying speech production including cortical and subcortical areas, such as the supplementary motor area, cingulate motor areas, primary motor cortex, basal ganglia, and cerebellum. Speech perception refers to the understanding of speech. The beginning of the process towards understanding speech is first hearing the message that is spoken. The auditory system receives sound signals starting at the outer ear. They enter the pinna and continue into the external auditory canal (ear canal) and then to the eardrum. Once in the middle ear, which consists of the malleus, the incus, and the stapes; the sounds are changed into mechanical energy. After being converted into mechanical energy, the message reaches the oval window, which is the beginning of the inner ear. Once inside the inner ear, the message is transferred into hydraulic energy by going through the cochlea, which is filled with fluid, and on to the Organ of Corti. This organ again helps the sound to be transferred into a neural impulse that stimulates the auditory pathway and reaches the brain. Sound is then processed in Heschl's gyrus and associated with meaning in Wernicke's area. As for theories of speech perception, there are a motor and an auditory theory. The motor theory is based upon the premise that speech sounds are encoded in the acoustic signal rather than enciphered in it. The auditory theory puts greater emphasis on the sensory and filtering mechanisms of the listener and suggests that speech knowledge is a minor role that’s only used in hard perceptual conditions. Speech is transmitted through sound waves, which follow the basic principles of acoustics. The source of all sound is vibration. For sound to exist, a source (something put into vibration) and a medium (something to transmit the vibrations) are necessary.