Table 1 Thresholds (dB rms re 20 µPa) of four Humboldt penguins at 9 different frequencies (Hz) calculated at five different threshold determination criterions (hr0.5 = hit rate 50%, d’1 = d-prime value 1, d’1.4 = d-prime value 1.4, hrprob0.5 = flexible hit-rate value at a level of the 50% probability of the cumulative normal distribution function, ranging from a hit rate of 20 to 80%, and d’prob0.5 = flexible d-prime value at a level of the 50% probability of the cumulative normal distribution function).

From: Biological relevance and methodological implications of unexpected hearing thresholds in a diving bird

  1. Non robust values, due to poorly fitted regressions, are marked in red; Standard deviation of different threshold determination criterions of each animal at each frequency are marked in blue; data in bold and italic were used for the mean thresholds in Fig. 4. For Fig. 7, data of mean and SD of hr0.5 = hit rate 50% were used.
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