Non-linear thresholds(describing how perception actually works versus Herbart's simpler model)
The point at which a stimulus (like sound or light) becomes noticeable doesn't follow a simple, straightforward pattern—small changes sometimes produce big jumps in perception, and vice versa.
Psychophysical processes(describing what Fechner and Wundt studied)
The relationship between physical stimuli (like light or sound) and the mental sensations we experience from them.
Saturation effects(describing another way perception doesn't follow simple rules)
When a stimulus gets very strong, adding more of it produces less and less additional perception—like how a very bright light doesn't seem much brighter when you make it even brighter.
Wundt(as a historical researcher who challenged Herbart's assumptions)
Wilhelm Wundt was a 19th-century German psychologist who founded experimental psychology and studied how the mind processes sensations and emotions through lab experiments.
inhibition(SW V: 307–308)
The metaphysical process by which opposed representations within the same continuum suppress or dim each other, governed by the soul's unity.