Table 5 Signal Quality Indices as described in ‘Data Quality Analysis’ in decibels (dB) for the EEG data, or in % of good quality data for EDA, BVP, and TEMP data.

From: Unobtrusive measurement of cognitive load and physiological signals in uncontrolled environments

	Lab1	Lab1	Lab1	Lab1	Lab2	Lab2	Lab2	Lab2	Wild	Wild	Wild	Wild
	EEG (dB)	EDA (%)	BVP (%)	TEMP (%)	EEG (dB)	EDA (%)	BVP (%)	TEMP (%)	EEG (dB)	EDA (%)	BVP (%)	TEMP (%)
UN_124	2.82	94.60	81.73	99.99	3.22	99.10	51.33	97.87	-1.07	95.29	68.85	94.53
UN_123	4.19	97.86	92.48	99.62	2.69	93.66	79.03	95.90	2.16	97.23	51.32	95.06
UN_122	4.73	98.13	85.37	99.99	3.52	94.62	85.59	96.61	2.88	98.13	88.93	98.70
UN_121	1.45	97.71	31.43	99.40	2.91	95.64	38.66	98.42	-5.00	98.52	07.92	98.08
UN_120	5.30	96.35	90.54	99.99	x	x	x	x	x	x	x	x
UN_119	3.54	97.41	88.19	99.99	2.14	97.14	70.87	97.11	4.35	93.50	58.92	26.75
UN_118	3.49	92.49	87.77	99.99	2.05	90.17	88.19	94.18	1.25	92.86	85.38	98.17
UN_117	4.89	87.87	36.97	99.76	3.85	93.70	47.93	99.45	-1.53	88.93	50.05	31.62
UN_116	2.13	97.30	86.89	99.99	4.24	96.75	75.42	98.48	4.90	96.67	60.50	96.90
UN_115	2.61	95.41	62.79	99.99	4.99	96.65	59.66	98.80	4.04	95.42	16.40	97.26
UN_114	3.71	92.51	76.52	99.99	1.78	97.34	96.33	99.98	0.82	92.60	70.47	92.42
UN_113	5.79	96.64	75.18	99.94	5.13	96.69	72.73	99.21	4.38	96.52	64.82	00.42
UN_112	5.42	96.08	77.10	95.47	x	x	x	x	3.33	95.28	00.00	00.00
UN_111	5.03	98.69	51.28	97.86	5.29	97.72	36.21	98.72	0.02	94.34	36.11	94.22
UN_110	3.85	98.23	66.15	99.99	4.42	97.46	92.80	99.99	1.44	96.05	67.99	95.25
UN_109	4.23	93.20	89.78	97.08	3.72	97.98	94.53	99.61	3.26	91.26	68.02	95.14
UN_108	5.18	95.84	65.15	99.26	4.66	89.71	80.65	95.47	3.50	92.06	00.00	00.00
UN_107	1.53	95.75	49.34	95.90	5.43	98.30	95.00	99.99	1.15	90.84	92.50	99.11
UN_106	6.08	98.64	64.23	99.62	0.17	96.30	80.83	97.69	8.47	97.60	70.81	96.07
UN_105	3.49	93.64	49.25	88.98	5.08	95.69	26.72	96.98	-6.10	96.08	15.07	50.42
UN_104	5.35	98.34	30.51	99.99	1.62	97.86	44.25	99.37	1.54	94.62	50.37	94.49
UN_103	-1.44	69.37	53.19	95.34	4.16	81.22	46.34	98.72	x	x	x	x
UN_102	1.86	83.52	30.69	98.65	3.00	11.50	80.99	99.60	2.54	79.23	00.00	06.92
UN_101	7.91	97.13	97.69	99.99	8.50	94.21	88.80	96.28	5.65	94.88	60.95	96.32

The EEG data was averaged across all electrodes while the Wild data was additionally averaged across all participant-controlled recordings. As can be seen, some participants cared about ensuring a good signal quality (e.g. UN_101), while some participants did not manage to record data of good signal quality on their own (e.g. UN_121). Across modalities, bad SQI-values are coded in italics, SQI-values between 1.0 and 1.5 (EEG) or between 50% and 75% of good signal quality (EDA, BVP, and TEMP) are coded in boldface, and recordings with the best average SQI-values are printed in a standard font. Non-existing recordings are depicted by the letter ‘x’. As can be seen, the BVP data in the uncontrolled environments shows the worst signal quality, while the EDA and EEG data in the controlled environments show the best signal quality due to the study directors ensuring proper sensor fit. The bad BVP and TEMP signal quality in some recordings in the uncontrolled environment suggest that the respective participants forgot to take the protective cap under the body of the E4 watch off before recording, resulting in the BVP and TEMP sensor being covered during a few recordings.

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Table 5 Signal Quality Indices as described in ‘Data Quality Analysis’ in decibels (dB) for the EEG data, or in % of good quality data for EDA, BVP, and TEMP data.

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