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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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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.


4 steps in apex experiments

4 Steps in APEX experiments

Stimulus generation

Experiment definition

Subject performs experiment

Analysis of results


Stimulus generation

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, …)


Experiment definition

Experiment definition


Experiment definition1

[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


Subject performs experiment

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


Analysis of results

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, …)


Analysis of results1

...

******************************************

Following results collected on Thu 26Sep02

Start time = 15:37:39

End time = 15:38:43

Duration = 64 s

[confusion matrix]

autobalbanaankonijnolifantschoen

400000

030000

005000

000400

000040

000003

[stimulus/response pairs]

olifantautobalschoenolifantolifant

olifantautobalschoenolifantolifant

Analysis of results

Results

Time

Compact data

Complete data


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