Converting effect sizes for a prior power analyis

#1
Hi,

I am trying to calculate the sample size for my EEG study. I will conduct paired samples t-tests (for both behavioral and neurophysiological data). However, while looking into existing studies with similar paradigms to find an estimate for effect sizes, all I can find are ANOVA results.

Is it possible to simply convert eta-squared into Cohen's d and to use this as an estimate for effect sizes?