The Nature of the Articulatory Code

Authors: Harald Höge


The paper investigates the nature of the articulatory code (AC), which contains the messages needed for cortical processing to perceive and produce speech. The paper claims that the AC is a multi-item neural code identical for both modalities - speech perception and speech production - and that the transport of the AC between the short-term memory and the speech processing areas is performed by coupled Ɵ/ɤ-oscillations. Due to the limitation given by the state of the art in measuring cortical activities, the structure and content of the AC is not deciphered yet. Using findings from research in phonetics and evolution and using invasive as well as non-invasive measurements of cortical activities of non-human and human primates, the paper is focused to verify the hypothesis, that each message of the AC describes the structure and content of a Ɵsyllable. The items of each message represent elementary articulatory gestures composing syllables and are coded based on bundles of manner & place like articulatory features. Further the items are generated by spike patterns of neurons connected to complexes of neurons sensitive to articulatory features and are transmitted by modulated ɤ-oscillations embedded in the Ɵ-oscillations. A final proof derived from cortical measurement for the proposed AC is still missing. Thus, there is a need for further cortical measurements.

Year: 2020
In session: Articulation
Pages: 133 to 141