Figure 2From: Differential effects of temporal regularity on auditory-evoked response amplitude: a decrease in silence and increase in noiseThe amplitude spectrum of white noise recorded at the ear piece. Because of our sound delivery system (plastic tube and ear piece), the sound spectrum exhibited a 2Â kHz low-pass filtered characteristic. Sample audio files of the test stimulus embedded in the background noise are available as Additional files 1 (Regular Sequencing) and 2 (Irregular Sequencing).Back to article page