Rasarnavasudhakara 2.149

2.149

atha (20) smṛtiḥ-
svāsthya-cintā-dṛḍhābhyāsa-sadṛśālokanādibhiḥ | 70
smṛtiḥ pūrvānubhūtārtha-pratītis tatra vikriyāḥ |
kampanodvahane mūrdhno bhrū-vikṣepādayo' pi ca ||

Now (20) recollection (smṛti):
Arising from health, reflection, persistent practice, seeing a resemblance, and so forth,
smṛti is the cognition of things previously experienced. Its physical expressions in this state are:
shaking or raising the head, moving the eyebrows, and so forth.