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APEX 2.0

APEX 2.0. A P E X. User friendly: NO programming skills required. pplication for. sycho-. lectrical. periments. e. L. Geurts and J. Wouters, 2000. A concept for a research tool for experiments with cochlear implant users. Journal of the Acoustical Society of America 108, 2949-2956.

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APEX 2.0

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  1. APEX 2.0 A P E X User friendly: NO programming skills required pplication for sycho- lectrical periments e L. Geurts and J. Wouters, 2000. A concept for a research tool for experiments with cochlear implant users. Journal of the Acoustical Society of America 108, 2949-2956.

  2. 4 Steps in APEX experiments Stimulus generation Experiment definition Subject performs experiment Analysis of results

  3. Stimulus generation • 1) Wav-files2)NICStream files (*.quf and *.qic)3)NIC1-files4)Laura files • Generate them in Matlab using NMT (Cochlear) and own functions • Or with other software (Klatt synthesizer, Waveform editing software, self-made software, …)

  4. Experiment definition

  5. [device] device=NUCLEUS [stimuli] path=c:\Nucleus\Matlab\_work\ stimulus=ACE_sin1500.quf,defaultstandard stimulus=ACE_sin1000.quf,label=1000 stimulus=ACE_sin1050.quf,label=1050 stimulus=ACE_sin1100.quf,label=1100 ... [method] start=1050 down=2 up=1 stop=12 ... Experiment definition

  6. Subject performs experiment • Stimulus playback • CPS (or PPS) and SPrint for Nucleus • Soundcard for wavs • TI C30 for Laura • Response input • Mouse • Keyboard • Pen-Pad • Touch Screen • Optional feedback

  7. Analysis of results • Results are appended to experiment file • Results depend on type of experiment • Mean of last reversals • Psychometric curve • Confusion matrix • Average of adjustments • … • Complete detailed results can be outputted • Stimulus – Response pairs • Easy “Copy and paste” to analysis program (Excel, Matlab, SPSS, SAS, …)

  8. ... ****************************************** Following results collected on Thu 26Sep02 Start time = 15:37:39 End time = 15:38:43 Duration = 64 s [confusion matrix] auto bal banaan konijn olifant schoen 4 0 0 0 0 0 0 3 0 0 0 0 0 0 5 0 0 0 0 0 0 4 0 0 0 0 0 0 4 0 0 0 0 0 0 3 [stimulus/response pairs] olifant auto bal schoen olifant olifant olifant auto bal schoen olifant olifant Analysis of results Results Time Compact data Complete data

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