Normal group algebras

Let $\mathbb{F}G$ denote the group algebra of the group $G$ over the field $\mathbb{F}$ with $char(\mathbb{F})\mathrm{\ne }2$. Given both a homomorphism $\sigma :G\to \{\pm 1\}$ and a group involution $\ast :G\to G$, an oriented involution of $\mathbb{F}G$ is defined by $\alpha=\Sigma\alpha_{g}g \mapsto \alpha^\circledast=\Sigma\alpha_{g}\sigma(g)g^{\ast}$. In this paper, we determine the conditions under which the group algebra $\mathbb{F}G$ is normal, that is, conditions under which $\mathbb{F}G$ satisfies the $⊛$-identity $\alpha {\alpha }^{⊛}={\alpha }^{⊛}\alpha$. We prove that $\mathbb{F}G$ is normal if and only if the set of symmetric elements under $⊛$ is commutative.