PSYC 1010 Lecture Notes - Lecture 8: Detection Theory, Red Color, Proprioception

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15 Nov 2017
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Sensation
Together- Phenomenological World = External Reality (The same) + Efforts to
Understand (can vary)
“Objective” world still involves subjective sensing & perceiving
Sensation: Psychophysics- Vision (Seeing), Audition (Hearing), Olfaction (Smell),
Gustation (taste), Somatosensory (touch), Proprioception (perception of distance),
Vestibular (balance)
Transduction: Conversion of physical energy into language the brain understands
Sense Receptors- specialized cell that transduce specific stimuli
Absolute Threshold- Lowest level of stimulus detectable in 50% of trials (generally
speaking).
Just Noticeable Difference (JND)- Smallest detectable change in intensity
Weber’s Law- Constant proportional relationship between JND and the original intensity
(The stronger the stimulus the greater the change necessary to detect the difference)
In the dark, a phone screen is bright and can be seen easily. If the room is lit
then the phone screen does not make a difference.
CAVEAT: Sensory Adaptation- sensitivity to unchanging, repetitive stimuli diminishes
over time. (After wearing a watch for a while, you don’t notice it’s there).
Signal Detection Theory- Detection of faint stimuli depends on…
1) Physiological sensitivity to stimuli (how sensitive one is to something /
decision making process)
2) Individual’s decision criterion for detection (nonsensory)
a. Personality traits, expectations, alertness, motivation, etc.…
Sensation: Attention = Selection of one sensory channel, while ignoring or minimizing
others
Filter Theory: bottleneck- only most important information ‘registers’ in our mind
Cocktail Party Effect: ability to detect relevant information despite other “noise”
Change Blindness: not seeing something changing right in front of you.
Inattentional Blindness: Failure to detect clear stimuli when attention is focused
elsewhere (Rose Niland) (Gorilla video)
BINDING- Synthesis of several data points into cohesive concept
Round shape + red color + smooth outside + sweet or tart taste + fresh smell =
Apple
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