Difference in HSM performance between the first and the second session.

<p>A repeated measures of ANOVA within factors strategy (F120, Phantom) and interaction time (Session1, Session2) revealed a significant effect for the interaction time and strategy [F(1.00) = 6.476; p = 0.029].</p

Subject demographics.

<p>Subject demographics.</p

Value of <i>σ</i> and corresponding M level on the Phantom channel for session 1.

<p>Value of <i>σ</i> and corresponding M level on the Phantom channel for session 1.</p

Results for the HSM sentence test during the second session.

<p>No significant difference was observed after Bonferroni correction (paired t-test p = 0.034).</p

Results for the question about the “overall impression” of music.

<p>The Phantom strategy was rated to sound significantly better than F120 (wilcoxon signed rank test p = 0.037).</p

Schematic illustration of the Phantom effect for <i>σ</i> = 0 (a) and <i>σ</i> = 0.625 (b) on pitch perception.

<p>The electrical field is simulated using triangular functions and assuming linear superposition of the electrical field produced by each electrode. The center of masses of the electrical field is assumed to be related to the pitch elicited by the stimulation. Using Phantom stimulation it is possible to push the electrical field away from the most apical electrode.</p

Stimulation pattern for one cycle of Phantom strategy stimulation.

<p>CSR is the Channel Stimulation Rate for one electrode. In the Phantom strategy, the electrode contacts 1 and 2 are stimulated simultaneously but out of phase prior to stimulating the rest of analysis bands using the standard in phase current steering technique.</p

SNR used to evaluate the HSM sentence test.

<p>SNR used to evaluate the HSM sentence test.</p

Results for the question “how easy is to follow the music”.

<p>No significant difference was observed between F120 and Phantom (wilcoxon signed tank test = 0.886).</p

Block Diagram of the Phantom Strategy.

<p>The Phantom strategy incorporates a low frequency analysis band used to deliver information to a partial bipolar (Phantom) channel. The rest of the analysis bands are exactly the same as in the commercial F120 strategy.</p