0 a speech sound produced by closing the vocal cords and then opening them quickly so that the air from the lungs is released with force
He shows that the left edge of the foot is the most important context for glottal stop insertion.
Data are also given to show that a glottal stop may appear adjacent to a stop, whether ejective or not.
The additional data provided show that a glottal stop may appear adjacent to a sonorant, without deriving a glottalised sonorant.
In fact, of all 945 tokens of pre-pausal /t/, there was not a single case of a glottal stop.
I know of no analyses in the literature that assume that glottal stop is ever the product of spreading.
The uvular fricatives are realised as postvelar or velar fricatives, and the uvular /q/ is pronounced as a glottal stop.
These are more plausibly the result of voicing assimilation triggered by the glottal stop, not examples of final devoicing.
These letters have quasistandard names as well, which is a simplified form that omits the final glottal stop.