Under the rules for the Paralyzed condition it states:
"A paralyzed character has effective Dexterity and Strength scores of 0 and is helpless, but can take purely mental actions."
So what is a "purely mental action"?
I ask because this question came up in my last session the Cleric in the party got paralyzed, and wanted to use Channel Energy. His argument was that even though he was paralyzed he had used Channel Energy last round, and thus would have been paralyzed in such a way that he would still be "presenting his holy symbol". I allowed it, partially because I thought his argument was relatively solid, and also because the combat might have been a TPK if he hadn't used channel energy that round. But I was left wondering what a mental action actually is.