Verse 16

यदा न स्पन्दते प्राणः शिरासरणिकोटरे ।असंवित्तिवशात्तेन चित्तमन्तर्न जायते

In plain words

When prāṇa does not pulse within the hollows of the channels of the veins, then, through the absence of saṃvit, citta does not arise within.