Polarity effect magnitude is similar across species even though its direction is reversed.

Evidence

The mean across subjects was ‑1.4, ‑3.1, ‑5.3 and ‑2.3 dB for SYM, RPS, RPS-IPG and TRI, respectively. Paired-sample t-tests with Bonferroni correction showed that this effect was larger for RPS than for SYM (t(8) = 3.6, p < 0.05) and also for RPS-IPG than for SYM (t(9) = 3.7, p < 0.05). For comparison, filled symbols show the polarity effects obtained using loudness-balancing experiments in human CI listeners for similar pulse shapes (Macherey et al. 2006 , 2008 ; Undurraga et al. 2013 ; Carlyon et al. 2013 ). Although the polarity effect is opposite in sign for the two species, it is interesting to note that its magnitude is similar for RPS and for TRI. — Dijk, Pim van, Physiology, Psychoacoustics and…, 2272

Categorization

• QUESTION: Opposite sign yet matching magnitude of polarity effect across species — does equal magnitude hint at a shared underlying mechanism differently gated?