Okay, the user wants me to translate "external perception" into Thai. Let me check the rules again. The first rule says to translate all content into Thai. The second rule states that if the content is already in Thai, leave it as is. The third rule is to provide only the translation without any explanations.
So, "external perception" is in English, so I need to translate it. The correct Thai translation for "external perception" would be "การรับรู้ภายนอก". I should make sure there's no explanation, just the translation. Let me confirm the term. "External" is "ภายนอก" and "perception" is "การรับรู้" in Thai. Yes, that seems right. I'll output just "การรับรู้ภายนอก" without any extra text.