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The SPSS data sets you need to use for this final task on statistics in this course

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Statistical Analysis Task

The SPSS data sets you need to use for this final task on statistics in this course are called “ASA”, i.e. Auditory Selective Attention (a perception task), and DNWR_SDS, i.e. Spectral Distance Score in a Delayed Nonword Repetition Task (a production task). This is a real data set from a study investigating the role of auditory selective attention in L2 learners’ ability to learn the English phonological vowel contrasts in cap-cup /kæp/-/kʌp/and feet-fit /fiːt/-/fɪt/. The DNWR test was administered twice, before and after a period of perceptual and productive phonetic training on the target contrasts /æ/-/ʌ/ (Low vowel contrast) and /iː/-/ɪ/ (High vowel contrast) using nonwords. The ASA data set is by subjects, the DNWR_SDS data set is by items. Some of the research questions below refer to the ASA data set only, others refer to both the ASA and the DNWR_SDS data sets. See below for a description of the ASA and the DNWR_SDS tasks.

ASA

Participants were presented with 64 pairs of sentences in English binaurally over headphones, each pair consisting of a target and a competing sentence. The two sentences in a pair were always different, spoken by a male and a female voice, and presented simultaneously (e.g. male: Ready CHARLIE go to BLUE SIX now; female: Ready TIGER go to RED EIGHT now). The sentences were all normalized for duration to 1700ms. A call signal (e.g. TIGER) appearing on the screen, previous to the auditory presentation of the sentences, cued the voice participants had to attend to for correctly identifying 1 of 4 colours and 1 of 8 digits visually presented on the screen. Individual ASA scores were computed by adding up all correctly identified colours and digits in each one of the two tasks up to a maximum score of 128.

         Ready CHARLIE go to BLUE SIX now

  DNWR_SDS

Participants performed a delayed nonword repetition task that elicited minimal pair nonwords and words targeting the two English vowel contrasts cap-cup /kæp/-/kʌp/and feet-fit /fiːt/-/fɪt/ before (T1) and after (T2) training. For each contrast participants were presented with 32 trials, 16 per vowel, 8 nonwords (on which participants had been trained) and 8 words (on which participants had not been trained) in order to assess generalization of training gains to words. Acoustic measures of the quality of the vowels were obtained and normalized and a spectral distance score (SDS) was computed to calculate the Euclidean distance between the two contrasting vowels within each one of the vowel pairs. The bigger the SDS, the larger the contrast was in the production of the contrasting vowels within each pair. A positive effect of training would therefore result in larger SDSs at post-test than at pre-test.

DNWR task procedure (listen + wait for beep + repeat)

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