Fig. 4

Heart rate during tasks from a sample speaker from UT-SCOPE-physical corpus. Shown are heart rate (in beats per minute) from the start of data collection until completion for (i) neutral speech entry only, (ii) cognitive task stress with speech entry using race car simulator, and (iii) physical task stress with speech entry using stair stepper. Each reading is taken every 15 s, so 65 readings for the physical stress task plot represents 16-min–15-s elapsed time