The paper describes the intrusive effect of what have been called parasitic sounds, namely preglottalization and the epenthetic schwa. These parasitic sounds seem to be, from the linguistic point of view, non-systemic and unjustified, but occur relatively frequently in Czech media speech, while not so often in ordinary situations. The results indicate that both phenomena are perceived by listeners as intrusive, though to a differen extent, based on both the segment to which they are attached and on selected acoustic properties.
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