Modafinil + racetams = neurotoxicity concerns?

I ran across the following uncited claim in this article: "This two-pronged effect whereby excitatory signaling is enhanced and gabaeric signaling is suppressed raises questions about the potential neurotoxicity of modafinil in combination with other allosteric modulators of glutamate receptors, such as the racetams."

Has anyone come across anything that would support/contradict increased potential for neurotoxicity of modafinil when paired with racetams?