Design of the sentence materials
The recorded sentences are designed around sixteen different test syllables, each spoken in three different lexical contexts: monosyllable, disyllable and trisyllable. The word containing the test syllable is referred to as the ``keyword''. The three keywords for each test syllable are referred to as ``keyword triads''. There are eight keyword triads in which the test syllable is always word-initial, the ``left-headed'' keywords, and eight in which the test syllable is always word-final, the ``right-headed'' keywords. The full set of right-headed keywords is shown in Table 1 and the full set of left-headed keywords is shown in Table 2.
The syllables immediately adjacent to the test syllable are
unstressed, to control stress-adjacent lengthening,
and are identical in the disyllables and trisyllables in each keyword
triad, to minimise any effect of local phonetic variation on test
syllable duration. Stress and phonetic environment are also controlled
in the carrier sentence.
For the recordings, the keywords are placed in sentences designed to be read as meaningful utterances, with a full normal prosodic realisation. At the same time, the length of the utterances and the immediate environment of the test syllables is controlled. The full design of the experimental materials is shown schematically in Table 2 for right-headed keywords. The design of the materials for left-headed keywords is the mirror-image of the syllable configurations shown.
The design shown in Table 3 systematically varies word length and utterance length. Where the test
syllable is utterance-medial, these factors are varied both
independently and concurrently. Where the test syllable is close to
the utterance edge, utterance length covaries with word length and
varies whilst word length is fixed.
Example sentences illustrate the five
series of test syllable environments resulting from this design (see
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