PS101 Lecture Notes - Lecture 4: Subliminal Stimuli, Absolute Threshold, Response Bias
Document Summary
1sensation and perception sensory input to organs and interpretation: see darkness, hear loudness, feel the hairs on our arms. Absolute threshold: the minimum amount of stimulation needed for an organism to detect a stimulus 50% of the time. If you hear something 5 times out of 10 then that sensation would be defined as your absolute threshold: colour of a traffic light at certain times of the day. Just noticeable difference: smallest detectable difference in the amount of stimulation: what will you notice if a sensation /stimulus is changed need to understand for energy save jnd of temperature fat free food. Weber"s law: the jnd is a constant proportion of the size of the initial stimulus how much change you notice is related to how large the initial stimulus. Fechner"s law: change in perceived intensity = f ( #jnds, absolute threshold) Signal detection theory: signal detection involves decision processes (interpretation, response bias) and sensory processes.
