Table 5.
Mean tactual detection thresholds and standard deviations (in dB re 1 μm peak displacement) for congenitally deaf and normal-hearing subjects across all vibratory frequencies examined, for left thumb and left index finger.
| Frequency | Left thumb | Left index finger | ||||||
|---|---|---|---|---|---|---|---|---|
| Congenitally | Normal | Congenitally | Normal | |||||
| Mean | s.d. | Mean | s.d. | Mean | s.d. | Mean | s.d. | |
| 2 | 42.0 | 3.9 | 43.2 | 2.6 | 42.7 | 3.6 | 43.3 | 3.6 |
| 5 | 37.5 | 4.6 | 37.4 | 4.0 | 37.9 | 2.8 | 37.1 | 5.8 |
| 10 | 32.0 | 3.4 | 31.8 | 1.9 | 33.2 | 2.6 | 32.1 | 5.6 |
| 25 | 24.9 | 7.7 | 26.5 | 3.2 | 24.3 | 3.7 | 23.6 | 5.4 |
| 50 | 4.4 | 7.5 | 5.9 | 5.6 | 3.2 | 5.8 | 6.3 | 6.8 |
| 100 | −11.4 | 7.0 | −6.9 | 4.6 | −14.3 | 7.8 | −12.7 | 6.9 |
| 200 | −22.8 | 5.0 | −21.2 | 2.5 | −21.9 | 8.8 | −22.0 | 3.1 |
| 250 | −24.1 | 6.5 | −27.1 | 7.3 | −22.9 | 6.4 | −21.6 | 4.8 |
| 300 | −25.2 | 5.7 | −23.9 | 5.7 | −21.8 | 5.7 | −21.5 | 5.8 |