“…Figure 2 shows the number of comparisons from the included studies showing an increase, decrease or no change in PFC activation when comparing either a) walking to standing or b) walking with an additional task to simple walking, according to group. In young people, 11 of the 20 comparisons from 13 studies reported significant increases in PFC activation (Lu et al, 2015;Suzuki et al, 2004;Lin and Lin, 2016;Hill et al, 2013;Holtzer et al, 2011;Maidan et al, 2018;Meester et al, 2014;Mirelman et al, 2014); five reported a reduction in PFC activation Koenraadt et al, 2014;Lin and Lin, 2016) and four reported no change (Koenraadt et al, 2014;. Although the aim of the study was to report changes in PFC activation, three studies (four comparisons) have also investigated activation in additional cortical areas in young people (Table 1) (Lu et al, 2015;Koenraadt et al, 2014;Suzuki et al, 2004).…”