the.com/experimental psychology

means The branch of psychology that studies the mind by running controlled experiments rather than just observing or theorizing about behavior.

from Psychology comes from the Greek psyche (breath, soul, mind) and -logia (study of), coined in the 1500s-1600s as scholars began treating the soul as something to be systematically examined rather than purely a theological matter. 'Experimental' traces to Latin experiri, 'to test or try,' the same root behind 'experience' and 'expert.' The field itself is usually dated to the 1870s, when researchers like Wilhelm Wundt set up laboratories to measure reaction times and sensations with instruments, insisting the mind could be probed with the same rigor as physics or chemistry — a deliberate break from philosophy's armchair.