Table 1: Description of central tendency data, dispersion and extremes of groups EWD, EDA and EDP, collected pre and post intervention.

Elderly Group Without Dementia Diagnosis (EWD)
	Alpha Waves					SMR Waves					Wok Memory Task
	Average Activity		Coefficient of Variation			Average Activity		Coefficient of Variation			Digit Span
	Pre intervention	Post intervention	Pre intervention		Post intervention	Pre intervention	Post intervention	Pre intervention		Post intervention	Pre intervention		Post intervention
Minimum	2.18	3.25	0.03		0.03	2.52	3.31	0.03		0.04	51		65
Maximum	59.77	50.81	1.29		2.56	51.44	39.2	1.17		1.72	95		100
Median	6.29	7.06	1.05		0.69	5.6	6.05	0.65		0.5	74		84
Standard deviation	15.56	12.07	0.41		0.66	12.91	8.94	0.39		0.49	14.46		9.96
Group of Elderly with Alzheimer's Diagnosis (EDA)
	Pre intervention	Post intervention		Pre intervention	Post intervention	Pre intervention	Post intervention		Pre intervention	Post intervention	Pre intervention		Post intervention
Minimum	3.09	4.53		0.1	0.08	2.36	1.25		0.08	0.1	29.54		32.95
Maximum	10.55	20.23		1.64	1.84	15.03	12.64		1.47	1.58	84.09		89.77
Median	4.49	8.84		0.88	0.78	4.44	5.59		0.44	0.54	56		67
Standard deviation	2.59	4.46		0.48	0.45	3.21	2.81		0.44	0.40	16.58		17.34
Group Elderly people with Parkinson's Diagnosis (EDP)
	Pre intervention	Post intervention		Pre intervention	Post intervention	Pre intervention	Post intervention		Pre intervention	Post intervention		Pre intervention	Post intervention
Minimum	2.99	3.99		0.03	0.04	2.15	3.09		0.04	0.04		57.9	57.95
Maximum	41.03	22.5		1.64	3.4	36.01	14.68		1.8	1.31		100	98.86
Median	6.8	5.99		0.48	0.49	4.82	5.01		0.49	0.43		84	90
Standard deviation	9.253	4.56		0.383	0.8	8.27	3.06		0.49	0.30		15.32	15.77