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Table 3 The comparisons of the distance between general speaker and parametric speaker

From: Physiological responses at short distances from a parametric speaker

  0.3 m 1.0 m 2.6 m
  parametric SP general SP parametric SP general SP parametric SP general SP
∆Sympathetic nerve activity 1.279 ± 0.301 0.631 ± 0.240 1.215 ± 0.338 1.551 ± 0.345 0.527 ± 0.559 1.616 ±0. 484*
∆Parasympathetic nerve activity -0.108 ± 0.028 -0.072 ± 0.024 -0.087 ± 0.025 -0.087 ± 0.020 -0.037 ± 0.005 -0.152 ± 0.045 +
∆SDPTG -0.056 ± 0.018 0.027 ± 0.012 0.055 ± 0.013 0.064 ± 0.026 0.834 ± 0.033 0.802 ± 0.026 +
∆α band ratio at Pz -0.001 ± 0.009 0.002 ± 0.003 0.015 ± 0.004 0.002 ± 0.004 0.040 ± 0.024 0.034 ± 0.083
reaction time 0.496 ± 0.097 0.876 ± 0.082 0.887 ± 0.089 0.939 ± 0.109 0.778 ± 0.044 0.852 ± 0.044 *
  1. #2.6 m, results of our previous study (Lee et al., 2011).
  2. *, parametric SP vs general SP (P <0.05).
  3. +, parametric SP vs general SP (P <0.1).