PS101, Lec 8: 02/14/2013
Sensation and Perception:
Sensation ex. Visual system (best ex. Cause we understand it best).
Visual stimuli and machinery ex. Brightness, hue, or saturation
Rods (dim, black and white) and cones (color).
Info goes from eye to thalamus.
*Answered question info goes from eye to thalamus.
What your eyes and fingers do, they transduce different forms of energy in the universe to
nerve impulses (chemical and electrical). Once they hit the thalamus, it sends it to its
corresponding lobe (their correct part of cortex).
Same type of nerve impulses are sent to the corresponding part of the cortex. Thalamus
relays the nerve impulses to proper area of primary visual, sensory, auditory
We can group things by whether they’re close together Proximal Grouping.
Our brain tends to organize information by proximity. (opposite of proximal is distal).
Another way to group things is by similarity. Similar Grouping.
Movie on perception, goal is to learn principles and terms in perception.
Sensory Receptors: Specialized cells with specific receptors.
Ex. Finger tips have specialized cells with touch and proprioception receptors.
Sensory Threshold: A) Absolute threshold. Smallest threshold that is detected 50% of the time. Ex. How far away a
candle can be for most people to still be able to see it burning about 50% of the time.
How much sugar you need to dissolve in a liter of water to detect that the water was sweetened 50% of the
Whether you’re able to hear a pin drop in a silent room 50% of the time.
B) Difference Threshold: Smallest change that we can detect 50% of the time. Acronym: jnd (just
Weber’s Law: If you determine the jnd for 1 quantity. Then you can use that absolute value to detect the
jnd 50% of