The paper endeavours to verify a commonly accepted observation that Polish homorganic stop geminates are unreleased. Fifteen Polish subjects participated in the experiment, producing stop geminates in different contexts specified for the place of articulation, articulatory tempo, and voiced-voiceless distinction. The collected samples were acoustically analysed for presence or absence of the release burst. The results do not corroborate a putative unreleased status of Polish homorganic stop geminates. They show, however, that the frequency of released geminates strongly depends on the place of articulation, with dental /t, d/ released most frequently. Voiceless stops tend to be more readily released than voiced stops, though this tendency is only close to significant. Moreover, a significant impact of the tempo of articulation on the occurrence of the release burst has been demonstrated for both voiced and voiceless stops - longer utterances are conducive to unreleased realisations of geminates.
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