Global convective plasma coupling parameter, Γ_conv, as a function of normalized main-sequence lifetime (t/t_tams) for our set of 243 stellar models of 1 M_⊙ and different metallicities. Each curve corresponds to a distinct metallicity value, as indicated in the legend. Increasing metallicity leads to higher Γ_conv values, indicating stronger plasma coupling and more significant collective effects in metal-rich stellar convective zones.