Nevrilicious Scans
joined Jun 5, 2015
I always thought the "voice" was just simplified way to call the abstract process everyone experience. You don't really "hear" anything, it's just different thoughts, images etc. floating around in your mind. When I think about something or create sentences in my mind, I don't actually use my voice or any voice, it just is there (unless I'm remembering quote or something). So I imagine, what Tsundere hears isn't any actual voice, but the raw thoughts of any given person. It would pose a question how she knows whose minds she reads, but since it's supernatural ability, I'd say she just does.
Kotoura-san presents it in the similar way. Kotoura was able not only to "hear", but also "see" the exact same thing other person was, so she wasn't just perceiving someone's inner voice, but also what they were imagining etc.