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Figure 2a. Signal responses (SR, percentage) as a function of the signal-to-noise ratio (LSNt) and of the time differential between presentation of the task and of the signal (DTAS) and (LSNt) as parameters. Signal: 1 kHz sinus tone noise: pink noise Task: Single arithmetical task Subjects: 20 k.A.: no task Figure 2b. Signal response (SR, percentage) reaction time (RT, s) as a function of the time differential between the beginning of presentation of the task and of the signal (DTAS) and the signal-to-noise ratio (LSNt) as parameters. Signal: 1 kHz sinus tone noise: pink noise Task: Single arithmetical task Subjects: 20 k.A.: no task

Figure 2a. Signal responses (SR, percentage) as a function of the signal-to-noise ratio (LSNt) and of the
time differential between presentation of the task and of the signal (DTAS) and (LSNt) as parameters.
Signal: 1 kHz sinus tone noise: pink noise
Task: Single arithmetical task Subjects: 20 k.A.: no task
Figure 2b. Signal response (SR, percentage) reaction time (RT, s) as a function of the time differential
between the beginning of presentation of the task and of the signal (DTAS) and the signal-to-noise ratio
(LSNt) as parameters.
Signal: 1 kHz sinus tone noise: pink noise
Task: Single arithmetical task Subjects: 20 k.A.: no task