Table 1.
The average levels (and standard errors) of the auditory and tactile stimuli (defined in the first row) used in the experiments. Auditory measurements of threshold and equal loudness are given in dB SPL. Tactile measurements of threshold and equal loudness are given in dB re 1 μm rms displacement. The second row provides measures of thresholds obtained with a 3I-2AFC adaptive procedure. The third row provides measurements of loudness matches of each stimulus to a 200-Hz reference stimulus at 25 dB SL. The fourth row describes the equal-loudness stimuli in terms of their individual sensation levels.
| Auditory | Tactile | ||||||
|---|---|---|---|---|---|---|---|
| Frequency (Hz) | 200 | 250 | 300 | 547 | 20 | 250 | 400 |
| Threshold (dB) | 26.6 (0.3) | 25.7 (0.4) | 26.9 (0.8) | 27.3 (0.5) | −3.6 (1.2) | −29.2 (2.6) | −18.2 (3.1) |
| Equal loudness (dB) | 51.6 (0.3) | 49.7 (0.3) | 49.2 (0.3) | 47.7 (0.4) | 5.1 (0.4) | −12.3 (0.9) | −6.9 (0.8) |
| Sensation level (dB) | 25.0 | 24.0 | 22.3 | 20.4 | 8.7 | 16.9 | 11.3 |