percipient

näkijä

tarkkanäköinen Having the ability to perceive, especially to perceive quickly.
puhekieltä Perceiving events only in the moment, without reflection, as a very young child.

Over time children advance from the percipient stage to the perceptive stage, in which they begin to reflect on the significance of events.

As anatomy, physiology and, later, psychology have developed into more or less well-organized sciences, they have necessarily and rightly come to incorporate the study of, among other things, the structures, mechanisms, and functionings of animal and human bodies qua percipient.

In the course of investigating the haunting, I interviewed several percipients.