Speech
Speech is the human voice used as a medium for language.
Speech is the use of the human voice as a medium for language, combining vowel and consonant sounds to form units of meaning like words, which belong to a language's lexicon. It is the default modality for language, though language can also be written or signed. Speech serves many intentional acts—informing, declaring, asking, persuading, directing—and can also unintentionally communicate social position, such as sex, age, place of origin, education, and physiological or mental condition. People may also use speech without intent to communicate, as in talking to oneself to organize cognition, memorize, or pray; some psychologists view this as a development of silent speech used in interior monologue to vivify thought, sometimes adopting a dual persona as if addressing another person.
Researchers study speech production and perception, speech repetition, errors, and the mapping of heard words onto vocalizations, which is key to vocabulary growth in children. Different brain areas, including Broca’s and Wernicke’s areas, underlie speech. The subject is studied by linguistics, cognitive science, communication studies, psychology, computer science, speech pathology, otolaryngology, and acoustics. Speech compares with written language, which may differ in vocabulary, syntax, and phonetics, a situation called diglossia.
The evolutionary origin of speech is debated. While animals communicate with vocalizations, and trained apes can use simple sign language, no animal vocalizations are articulated phonemically and syntactically, and thus do not constitute speech. Humans have uniquely evolved use of the tongue, lips, and other movable parts for sound production. Determining the timeline of speech evolution is difficult because the vocal tract does not fossilize, and indirect evidence from hominid fossils is inconclusive.
Speech production is an unconscious multi-step process: selecting words and their forms from the lexicon and morphology, organizing them through syntax, retrieving phonetic properties, and articulating the sentence. Articulatory phonetics studies how the tongue, lips, jaw, vocal cords, and other organs make sounds, categorized by place and manner of articulation. Normal human speech is pulmonic, using lung pressure to create phonation in the larynx, modified by the vocal tract and mouth. However, alaryngeal speech—esophageal, pharyngeal, and bucca
- field
- Linguistics, cognitive science, communication studies, psychology, computer science, speech pathology, otolaryngology, acoustics
- known_for
- Primary modality of human language; subject of study across multiple disciplines; evolutionary origin debated
Lore & Background
Speech production is an unconscious multi-step process: thoughts are generated into spoken utterances through selection of words from the lexicon, morphological and syntactic organization, retrieval of phonetic properties, and articulation using the tongue, lips, jaw, vocal cords, and other speech organs. Articulatory phonetics studies how these organs produce sounds, categorized by manner and place of articulation. Normal human speech is pulmonic, using pressure from the lungs, but alaryngeal speech—esophageal, pharyngeal, and buccal—is also possible. Speech perception is categorical: listeners put sounds into categories rather than perceiving a spectrum. For example, voice onset time differences across categorical boundaries are more easily detected than equal differences within a category. Speech errors, common especially in children, provide evidence for models of language production and acquisition; for instance, over-regularizing past-tense suffixes shows that regular forms are acquired earlier. Errors in aphasia patients help map speech components in the brain. Most children develop proto-speech babbling at four to six months, say first words during the first year, and produce short sentences by age four. Speech repetition—turning heard speech into motor instructions for imitation—plays a key role in vocabulary expansion. The evolutionary origin of speech remains debated; no animal vocalizations are articulated phonemically and syntactically, and the human vocal tract does not fossilize, making timeline determination challenging.
Reader's Guide
Speech is central to human communication and cognition, studied across linguistics, psychology, neuroscience, and other fields. Its significance lies in its complexity: production involves unconscious selection of words, syntax, and articulation; perception is categorical, aiding rapid understanding. Speech errors and aphasia patterns have informed models of language processing and brain mapping. The development of speech in children—from babbling to sentences—highlights its role in vocabulary growth and cognitive organization. The evolutionary debate underscores speech's uniqueness: no animal uses vocalizations with phonemic and syntactic structure, and the human vocal tract's specialized use of tongue and lips sets speech apart. Speech also compares with written language, sometimes creating diglossia. Its study has practical applications in computer speech recognition and therapy for hearing- and language-impaired individuals. Despite uncertainties about its origins, speech remains the default and most widespread modality for language, shaping human interaction and thought.
Did You Know?
- Speech can be produced without lungs or glottis in alaryngeal forms: esophageal, pharyngeal, and buccal speech.
- Children often make errors like over-regularizing past-tense suffixes (e.g., 'singed' instead of 'sang'), showing regular forms are acquired earlier.
- Speech perception is categorical; listeners detect differences across category boundaries more easily than within them.
- No animal vocalizations are articulated phonemically and syntactically, and thus do not constitute speech.
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