Table 2.

Framework for stress detection: rules, critical values, and the adopted ternary scoring system.

Rule	Phys. Signal	Feature	Condition for Scoring Value: 1	Condition for Scoring Value: 0.5	Condition for Scoring Value: 0
R1	GSR	Increase	[gt:gt+n]′ > 0 where 2 ≤ n ≤ 5	[gt:gt+n]′ > 0 where 5 < n ≤ 8	[gt:gt+n]′ > 0 where n < 2 and n > 8
R2	ST	Decrease	[Tt+3:Tt+m]′ < 0 where m > 3	[Tt+2:Tt+m]′ < 0 where 5 ≤ m ≤ 6	[Tt+3:Tt+m]′ < 0 where m < 3
R3	GSR	Rising time (RT)	$1\le {\mathrm{t}}_{\mathrm{peak}}-{\mathrm{t}}_{\mathrm{onset}}\le 5$	$5<{\mathrm{t}}_{\mathrm{peak}}-{\mathrm{t}}_{\mathrm{onset}}\le 15$	${\mathrm{t}}_{\mathrm{peak}}-{\mathrm{t}}_{\mathrm{onset}}>15$
R4	GSR	Response slope (RS)	$\frac{{\mathrm{g}}_{\mathrm{peak}}-{\mathrm{g}}_{\mathrm{onset}}}{{\mathrm{t}}_{{\mathrm{g}}_{\mathrm{peak}}}-{\mathrm{t}}_{{\mathrm{g}}_{\mathrm{onset}}}}$ ≥ 10°	$\frac{{\mathrm{g}}_{\mathrm{peak}}-{\mathrm{g}}_{\mathrm{onset}}}{{\mathrm{t}}_{{\mathrm{g}}_{\mathrm{peak}}}-{\mathrm{t}}_{{\mathrm{g}}_{\mathrm{onset}}}}$ ≥ 8°	$\frac{{\mathrm{g}}_{\mathrm{peak}}-{\mathrm{g}}_{\mathrm{onset}}}{{\mathrm{t}}_{{\mathrm{g}}_{\mathrm{peak}}}-{\mathrm{t}}_{{\mathrm{g}}_{\mathrm{onset}}}}$ < 8°
R5	-	Δt between MOSi and MOSi + 1	${\mathrm{t}}_{{\mathrm{MOS}}_{\mathrm{i}+1}}$ − ${\mathrm{t}}_{{\mathrm{MOS}}_{\mathrm{i}}}\le$ 10 s	-	${\mathrm{t}}_{{\mathrm{MOS}}_{\mathrm{i}+1}}$ − ${\mathrm{t}}_{{\mathrm{MOS}}_{\mathrm{i}}}$ > 10 s

Abbreviations: GSR: Galvanic skin response; ST: Skin temperature; MOS: Moment of stress.