A series of dots arranged in the shape of a face will be perceived as a face, not a series of dots. A psychologist studying this phenomenon is applying the principals of

The correct answer is Gestalt psychology

The term Gestalt, means form or configuration, but it is not widely used in Psychology because it does not match its meaning in this area specifically.

Gestalt Psychology is a coherent theory within the history of Psychology.

Developed by Chrinstiam von Ehrenfels, philosopher and psychologist, Gestalt Psychology studies the sensations (psychological data) of space-form and time-form (physical data).

The bases of this psychological theory were structured from these studies, which established the form and its perception, by Max Wertheimer, Wolfgang Köhler and Kurt Koffka.  

Gestalt theory studies the perception and sensation of movement, the psychological processes involved in the face of a stimulus and how it is perceived by the subject.

this question your asking is true hope this and you get a 100 percent : )

answer; the changing age structure of the population;