perception of speech sounds by the listener ( how
a listener understands a sound, in Kazakh/ Russian there is no sound Ө, that’s why our children have to work out a new set of box in their minds for this sound)
Functional aspect its function – to differentiate, e.g. [t] – occlusive, plosive, aspirate, voiceless, fortis; but: twice (labialized variant), try (post-alveolar v.), little (exploded literally), kitten (exploded nasally), tea (becomes narrower), state (loses aspiration).