I don't know about all that scientific stuff, but both my iguana and my tegu can obviously hear me. If they are basking with their eyes closed and I say something like "hello", they open their eyes, look at me, then close them again. I say something more, again opens eyes, looks at me, then back to enjoying the "sun". Unlike humans, they don't seem to get bored of this, and I can repeat this standing there 10 times and they keep responding the same.
That's how I found out about all that nonsense about them not seeing red light. I got one of those red night heat bulbs many years ago. Turn it on, open eyes. Switch it off, can't see him, but when I turn it on again, eyes are closed, and he opens them again till I turn it off.
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