Sensation is the process of detecting environmental information that meets a threshold and transducing stimuli into neurochemical messages for perception.
Sensation is the process by which sensory receptors and the nervous system receive and represent stimulus energies from the environment.
Mechanistically, it involves transduction: converting physical energy from stimuli into neural signals.
For example, in vision, light hits the retina, and photoreceptors convert this light into electrical signals.
These signals travel to the brain for perception.
Sensation operates on thresholds: the absolute threshold is when a stimulus is detected 50% of the time.
Sensory adaptation occurs when sensitivity diminishes due to constant stimulation.
Weber's Law quantifies the just-noticeable difference, stating that the change needed to detect a difference is a constant proportion, not a fixed amount.
The pitfall here is assuming sensation and perception are the same.
They're not.
Sensation is the raw data collection; perception is the brain's interpretation.
Mixing them up leads to incorrect explanations of how we experience the world.
Misunderstanding these processes means failing to predict how sensory information guides behavior and mental processes.