## 3 Results
### Study Characteristics  
A sample of the data collected for the 44 studies that were included in the systematic review are presented in Tables 1 and 2 (for more detail, see Tables A1 and A2 in Appendix A). Most of them were published in 2015 and 2018 (N = 11), followed by 2017 in which 8 studies conducted, and then by 2016 and 2019, which had the same number of studies (N = 6), and only 2 were in 2020. Around 63% (N = 28) took place in Europe, following North and South America with 27.7% (N = 10). A total of 5 studies were conducted in Asia, and 1 was conducted in Australia. Finally, the majority of studies were published in journals (only 1 study was a conference paper), scoping mostly in psychology (45.5%; N = 20) and medical-psychiatric journals (around 20%; N = 9), and the remaining were related to computer science (N = 15, 35%). Most studies used a between-groups design with pre-post or only post-measures (N = 36), including two (N = 27), three (N = 8) and four (N = 1) groups. On the other side, 8 studies were single-group designs. \begin{table}
\begin{tabular}{l c c} \hline \multicolumn{1}{c}{**Author(s); Year**} & **Sample; Size** & **Mean Age (years); \%Female** \\ \hline [PERSON] et al.; 2018 [62] & Adolescents; 60 & 13.8; 21.66 \\ \hline [PERSON] et al.; 2018 [63] & Students with ADHD; 88 & 10.2; 25 \\ \hline [PERSON] et al.; 2016 [64] & Schizophrenia patients; 8 & 38.6; 12.5 \\ \hline [PERSON] et al.; 2017 [65] & Healthy adults; 55 & 65.3; N/A * \\ \hline [PERSON] et al.; 2015 [66] & Healthy adults; 90 & 21; 57 \\ \hline [PERSON] et al.; 2019 [67] & Healthy older adults; 83 & 63.93; 47 \\ \hline [PERSON] et al.; 2018 [68] & Adolescents with ADHD; 70 & 9.95; 15.71 \\ \hline [PERSON] et al.; 2018 [69] & Adolescents; 84 & 13.7; 60 \\ \hline [PERSON] and [PERSON]; 2016 [70] & Healthy older adults; 5 & 67.6; N/A \\ \hline [PERSON] et al.; 2016 [71] & Older adults; 60 & 72.35; 57 \\ \hline [PERSON] et al.; 2016 [72] & Older adults; 29 & 73.25; N/A \\ \hline [PERSON] et al.; 2017 [73] & Overweight adults; 67 & 47.97; 75 \\ \hline [PERSON] et al.; 2015 [74] & MS patients; 52 & 43.9; 74.3 \\ \hline [PERSON] et al.; 2015 [75] & Children with autism spectrum disorder; 90 & 10.56; 9 \\ \hline [PERSON] and [PERSON]; 2018 [76] & ADHD children; 26 & 10.54; 30.76 \\ \hline [PERSON] and [PERSON]; 2016 [77] & Older adults; 794 & 61.95; 77 \\ \hline [PERSON] et al.; 2015 [78] & Children with ADHD; 81 & 10.5; 20 \\ \hline [PERSON] et al.; 2015 [79] & Children with a clinical diagnosis of ADHD; 17 & 50–90 y.o; N/A \\ \hline [PERSON] et al.; 2018 [80] & Healthy older adults; 97 & 70.5; 66.5 \\ \hline [PERSON] et al.; 2019 [81] & Children; 28 & 11–23 y.o.; 42.85 \\ \hline [PERSON] et al.; 2019 [82] & Children and adolescents with fragile X & 15.28; 37 \\  & syndrome; 100 & 15.28; 37 \\ \hline [PERSON] et al.; 2015 [83] & MS patients; 28 & 47.18; 75 \\ \hline [PERSON] et al.; 2018 [84] & Children; 60 & 9.31; 38 \\ \hline [PERSON] et al.; 2015 [85] & Older adults; 209 & 70; 78.4 \\ \hline [PERSON] et al.; 2017 [86] & University students; 115 & 19.98; 58 \\ \hline [PERSON] et al.; 2015 [87] & Older adults; 14 & 82.7; 93 \\ \hline [PERSON] et al.; 2015 [88] & Healthy older adults; 51 & 69.9; 48 \\ \hline [PERSON] et al.; 2015 [42] & University students; 30 & 23.8; 80 \\ \hline [PERSON] and Band; 2017 [89] & Healthy adults; 72 & 23; 56 \\ \hline \end{tabular}
\end{table} 
Table 1: Summary of studies included in the systematic review.