Human perceptual experiences depend on stimuli which arrive at one's various sensory organs from the external world and these stimuli cause changes in one's mental state.

"Critical" as used in the expression "critical thinking" connotes the importance or centrality of the thinking to an issue, question or problem of concern.

The unconscious was considered by Freud throughout the evolution of his psychoanalytic theory a sentient force.

In the "Definitions" chapter of Jung's seminal work Psychological Types, under the definition of "collective" Jung references representations collectives.

Cognitive psychologists use psychophysical and experimental approaches to understand, diagnose, and solve problems.

Thought generally refers to any mental or intellectual activity involving an individual's subjective consciousness.

Internal pattern generation operates on a wide range of time scales, from milliseconds to hours or longer.

Although the simplest reflexes may be mediated by circuits lying entirely within the spinal cord.

Experimental studies of electrophysiology, beginning in the early 20th century and reaching high productivity by the 1940s.

The neurotransmitter then binds to receptors embedded in the postsynaptic membrane, causing them to enter an activated state.