Noninvasive Cochlear Stimulation System

Mean Change in Electric Current Subjects Indicated They Could Hear a Tone at Certain Frequencies

Evaluated by increasing the amplitude of the current input until the subject could hear a tone at 250 Hz, 500 Hz, 1,000 Hz, 2,000 Hz, 4,000 Hz, 8,000 Hz, 10,000 Hz, 12,500 Hz and 16,000 Hz. The mean electric current is reported in Milliampere (mA).

Time frame: Baseline, approximately 2 hours

Speech Intelligibility in Quiet Environment

Measured using the modified rhyme test (MRT) consisting of a set of 50 six-item wordlist. Each word list contains single syllable words with a consonant-vowel-consonant sound sequence. Subjects completed electrical word recognition testing in a quiet environment. Electrodes were placed at 3 unique locations (forehead, mastoid, neck) to measure how well speech could be delivered to the subject through the skin electrodes in a manner that would allow subjects to recognize words in a quiet environment. There were 2 experiments done for speech intelligibility. The first involved 20 subjects (outcome 2) and aimed to assess speech intelligibility performance in a basic, quiet environment without background noise. This phase focused on evaluating the fundamental hearing performance. Once it was established that speech intelligibility was satisfactory with electrical stimulation, we proceeded to test an additional 30 subjects in both quiet and noisy environments (outcome 3).

Time frame: Baseline, approximately 2 hours

Speech Intelligibility in Quiet and Noisy Environments

Measured using the modified rhyme test (MRT) consisting of a set of 50 six-item wordlist. Each word list contains single syllable words with a consonant-vowel-consonant sound sequence. Subjects completed electrical word recognition testing in a quiet, then a noisy environment. Electrodes were placed at 3 unique locations (mastoid, wrist, back) to measure how well speech could be delivered to the subject through the skin electrodes in a manner that would allow subjects to recognize words in a quiet and noisy environment. There were 2 experiments done for speech intelligibility. The first involved 20 subjects (outcome2) and aimed to assess speech intelligibility performance in a basic, quiet environment without background noise. This phase focused on evaluating the fundamental hearing performance. Once it was established that speech intelligibility was satisfactory with electrical stimulation, we proceeded to test an additional 30 subjects in both quiet and noisy environments (outcome3)