Sensory Perception

Question 1

Just noticeable difference

Answer 1

Passing the threshold of discriminating 2 measurements (2.02 lbs vs 2lbs)

Question 2

Weber’s Law

Answer 2

The ratio of just noticeable difference to standard measurement. Ratio is constant. (Lower weight has lower JND, Higher weight has higher JND)

Delta I/I=constant

Linear

Question 3

Absolute threshold of sensation

Answer 3

Lowest level of stimulus that we can detect 50% of the time. Can be influenced by psychological state (if I expect a text I’ll be more likely to recognize my phone ring)

Question 4

Subliminal messaging

Answer 4

Stimuli below our absolute threshold of sensation

Question 5

Somatosensation types

Answer 5

Types: thermoception, mechanoception(pressure), nociception (pain), propioception (position).

Question 6

Somatosensation intensity

Answer 6

If the sensations are very frequent it is more intense. If the signal is more sparse (slow firing) then it’s less intense

Question 7

Somatosensation timing

Answer 7

Non adapting: action potentials don’t change

Slow adapting:APs gradually change

Fast adapting: APs change quickly

Question 8

Vestibular system

Answer 8

Ear system that detects balance, dizziness

Question 9

Signal detection theory

Answer 9

Decision making with uncertainty. Is the signal there, and can you recognize it

Question 10

Bottom up processing

Answer 10

Begins with stimulus. Stimulus influences our perception. No preconceived ideas.

DATA DRIVEN

Question 11

Top down processing

Answer 11

Using background knowledge to influence what is being perceived.

Using what’s in our head to determine what we’re perceiving

Question 12

Gestalt Principle

Answer 12

Similarity: grouping similar objects

Pragranz: reality is reduced to simplest form– Olympic Rings are 5 rings, not a lot of complex shapes

Proximity: objects close to each other are grouped

Continuity:lines are seen along the smoothest path

Closure: mind fills in gaps to form recognized images