Linguistic sounds, considered as external, physical phenomena have two aspects, the motor and the acoustic.
Roman JakobsonA new era in the physiological investigation of linguistic sounds was opened up by X-ray photography.
Roman JakobsonThe function of poetry is to point out that the sign is not identical to the referent.
Roman JakobsonSemantics, or the study of meaning, remained undeveloped, while phonetics made rapid progress and even came to occupy the central place in the scientific study of language.
Roman Jakobson