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When land across the mountains became available in the early nineteenth century,
Sensation
The process by which our sensory receptors and nervous system receive and represent stimulus energies from our environment.
Nervous System
A complex network of nerves and cells that carry messages to and from the brain and spinal cord to various parts of the body.
Stimulus Energies
The physical or chemical forms of energy, such as light, sound, or touch, that can be detected and interpreted by sensory systems.
Psychophysics
The study of relationships between the physical characteristics of stimuli, such as their intensity, and our psychological experience of them.
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