PSY 111 Lecture Notes - Lecture 10: Detection Theory, Absolute Threshold, Far-Sightedness
Document Summary
Sensation the stimulus-detection process by which our sense organs respond to and translate environmental stimuli into nerve impulses that are sent to the brain. Perception active process of organizing the stimulus input and giving it meaning. Stimulus detection absolute threshold designated as the lowest intensity at which a stimulus can be detected 50% of the time. Signal detection theory concerned with the factors that influence sensory judgments. Decision criterion standard of how certain a person must be that a stimulus is. Increased rewards for noticing stimuli often results in lower detection thresholds. Increased danger/punishment for noticing stimuli often raises detection threshold. Difference threshold smallest difference between two stimuli that can be perceived 50% present before they will say they detect it of the time (just noticeable difference jnd) Weber"s law to perceive a difference between two stimuli, one must differ by a constant ratio.
