PSY 105 Chapter Notes - Chapter 4: Sclera, Electromagnetic Spectrum, Wavelength
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ex. Photoreceptor, pressure, waves, chemical molecules, mecanoreceptors, thermal
•Perception: Process by which the brain organizes and interprets sensory
•Sensory problems (e.g.,cataracts)
•Perceptual problems (e.g., phantom limb pain, prosopagnosia)
•Studies the relationship between the physical nature of stimuli (amplitude,
frequency, intensity, chemicals that generate a scent,…) and the sensory responses
from the organism.
•Signal detection: Not only the intensity of the stimulus, but a lot of psychological
factors may have an impact: past experiences, expectations, motivations, fatigue,
environnemental factors (noises)
e.g. Haunted house
Psychophysics : Relation between the physical nature of stimuli and the sensory
reactions in response to those stimuli.
• Tries to create a bridge between the exterior physical environment and the internal
•Difference threshold ≠ fixed. It’s proportional to the initial stimulus value.
•Weber’s Law : Law that states that the just noticeable difference is a consistent
proportion of the intensity of the initial stimulus.
Note : Threshold: The minimal intensity needed to just barley detect stimulus
e.g. Two lights --8%
Two weights --2%100-102…1,000--1020
Two tones --0.3%
Two prices--10%$0.85 = $0.94
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