{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,9,28]],"date-time":"2025-09-28T04:12:00Z","timestamp":1759032720041},"reference-count":9,"publisher":"Acoustical Society of America (ASA)","issue":"6","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2000,12,1]]},"abstract":"<jats:p>APEX, an acronym for computer A\u00afpplication for P\u00afsycho-E\u00aflectrical\u2008eX\u00afperiments, is a user friendly tool used to conduct psychophysical experiments and to investigate new speech coding algorithms with cochlear implant users. Most common psychophysical experiments can be easily programmed and all stimuli can be easily created without any knowledge of computer programing. The pulsatile stimuli are composed off-line using custom-made MATLAB (Registered trademark of The Mathworks, Inc., http:\/\/www.mathworks.com) functions and are stored on hard disk or CD ROM. These functions convert either a speech signal into a pulse sequence or generate any sequence of pulses based on the parameters specified by the experimenter. The APEX personal computer (PC) software reads a text file which specifies the experiment and the stimuli, controls the experiment, delivers the stimuli to the subject through a digital signal processor (DSP) board, collects the responses via a computer mouse or a graphics tablet, and writes the results to the same file. At present, the APEX system is implemented for the LAURA (Registered trademark of Philips Hearing Implants) cochlear implant. However, the concept\u2014and many parts of the system\u2014is portable to any other device. Also, psycho-acoustical experiments can be conducted by presenting the stimuli acoustically through a sound card.<\/jats:p>","DOI":"10.1121\/1.1321011","type":"journal-article","created":{"date-parts":[[2002,7,26]],"date-time":"2002-07-26T14:21:16Z","timestamp":1027693276000},"page":"2949-2956","update-policy":"http:\/\/dx.doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":14,"title":["A concept for a research tool for experiments with cochlear implant users"],"prefix":"10.1121","volume":"108","author":[{"given":"Luc","family":"Geurts","sequence":"first","affiliation":[{"name":"Laboratoire Experimental ORL, KULeuven, Kapucijnenvoer 33, B\u20093000\u2009Leuven, Belgium"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jan","family":"Wouters","sequence":"additional","affiliation":[{"name":"Laboratoire Experimental ORL, KULeuven, Kapucijnenvoer 33, B\u20093000\u2009Leuven, Belgium"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"231","reference":[{"key":"2023071405051487600_car","doi-asserted-by":"crossref","first-page":"140","DOI":"10.1016\/S0378-5955(99)00215-4","article-title":"Detection of small across-channel timing differences by cochlear implantees","volume":"141","year":"2000","journal-title":"Hear. 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