Obstruent voiced obstruents are common. This contrasts with sonorants, which are prototypically voiced and only rarely voiceless. Obstruent An obstruent is a speech sound such as , , or that is formed by "obstructing" airflow. Obstruents contrast with sonorants, which have no such obstruction and so resonate. All obstruents are consonants, but sonorants include both vowels and consonants. Obstruents are subdivided into plosives (oral stops), such as , with complete occlusion of the vocal tract, often followed by a release burst; fricatives, such as , with limited closure, not stopping airflow but making it turbulent; and affricates, which begin with complete
The Instance of the Letter in the Unconscious, or Reason Since Freud extreme controversy, and is not at all acknowledged as an informed criticism by Lacanian theorists. Nevertheless, Élisabeth Roudinesco concludes that 'this extraordinary intellectual operation, by means of which Lacan endowed psychoanalytic doctrine with a Cartesian theory of the subject and a "post-Saussurian" conception of the unconscious...alone would earn him a place among the great theoreticians of the twentieth century'. The Instance of the Letter in the Unconscious, or Reason Since Freud "The Instance of the Letter in the Unconscious, or Reason Since Freud" () is an essay by the psychoanalyst Jacques Lacan, originally delivered as a talk on May 9,