As mentioned above, the simple main effect of Solution Style, i.e ., the personal evaluation of each participant about her/his own responses being the result of an insight- or analytic-based problem-solving process, showed a marginally significant effect [F (1,29) = 2.79, p = 0.066].
A trend toward significance for Solution Style was also found [F (1,29) = 2.39, p = 0.096].
No significant main effects were found for spectral power computed within the θ [F (2,28) = 0.345, p = 0.498] and β [F (2,28) = 0.344, p = 0.516] bands, while a trending toward significance result was found for activity in the α band (i.e. 8–12 Hz) [F (2,28) = 2.93, p = 0.098].