lecturer 1 [ʂ] in isolation lecturer 2 [ʂ] in isolation lecturer 3 [ʂ] in isolation
Based on Maciołek & Tambor (2012)
Voiceless: the vocal folds are separated, not vibrating, the air flows freely between them.
Retroflex: the tip of the tongue gets close to the upper palate behind the alveolar ridge. At the same time the back of the tongue rises towards the soft palate. The lips are slightly rounded.
Non-palatalized: the middle of the tongue is in a neutral position, it does not take part in the articulation.
Fricative: there is a narrow passage between the articulators, the air from the lungs hits the edge of the passage and creates noise.