PSYCH 104 Midterm 2 (sensation and perception) Flashcards

1
Q

Sensation

A
  • Sensation
    ○ The process by which (objective) stimuli are detected, transduced into nerve impulses and sent to the brain
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Perception

A
  • Perception
    ○ The brains interpretation of raw sensory inputs
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Transduction

A
  • Transduction
    ○ The process of converting an external energy or substance into electrical activity within neurons
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Sense receptor

A
  • Sense receptor
    ○ Specialized cell responsible for converting external stimuli into neural activity for a specific sensory system
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Sensory adaptation

A
  • Sensory adaptation
    ○ Activation is greatest when a stimulus is first detected and then declines in responsiveness
    ○ Also called neural adaptation
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Psychophysics

A
  • Psychophysics
    ○ The study of how we precieved sensory stimuli based on their physical characteristics
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Absolute threshold

A
  • Absolute threshold
    § Lowest level of a stimulus needed for the nervous system to detect a change 50 percent of the time
    ○ Just noticeable difference (JND)
    § The smallest change in the intensity of s stimulus we can detect
    ○ Weber’s law
    § There is a constant proportional relationship between the JND and original stimulus intensity
    § I = intensity of the stimulus
    § K = constant
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

JND

A

JND: the louder the volume is, the greater the change in volume that is needed to detect a difference

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

JND (Formula)

A

JND = K x I
§ I = intensity of the stimulus
§ K = constant (0.10)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Signal detection theory

A

Signal detection theory
- Asks two questions
○ Was waldo in the image?
○ Did you say waldo was in the image?

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Signal

A

Signal = stimulus to be perceived

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Signal detection theory (Noise)

A

Noise = everything else

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What does Increased sensitivity to the signal cause?

A

Increased sensitivity to the signal causes hits and correct rejections to occur more often

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What does Decreased sensitivity to the signal cause?

A

Decreased sensitivity to the signal causes misses and false alarms to occur more often

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

How are differences in sensitivity measured?

A

Differences in sensitivity are measured with a statistic called D-prime
- A measure of the stimulus salience
- Plotted using ROC curves (Receiver operating characteristic curves)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What does a perfect signal detection theory test do?

A

A perfect test hugs the Y axis
- You want the curve to bend as close to the top left curve as possible

17
Q

Police line ups accuracy?

A

Police lineups accuracy
- One by one: 30% accurate
- All at once: 39% accurate
- The false alarm rate is higher in the all at once

18
Q

What do police line ups show us?

A

This shows us that the simultaneous method is better than the sequential but it is barely noticeable

19
Q

What do polygraphs need to be accurate?

A

Polygraphs: they actually need to be set in terms off sensitivity un order to administer the test

20
Q

What is the issue with polygraphs?

A

They are more correct than not but they also make many false positives

21
Q

Perception

A

Perception
- Perception is determined by three basic elements
○ What is currently being sensed
○ What was sensed
○ What has happened in the past

22
Q

Perception - Parallel processing

A
  • Parallel processing: the ability to attend to many sense modalities simultaneously
23
Q

Perception - Bottom up processing:

A
  • Bottom up processing: processing in which a whole is constructed from its parts
24
Q

Perception - Top-down processing

A
  • Top-down processing: conceptually driven processing influenced by beliefs and prior learning
25
Q

Perceptual set

A

Perceptual set: A set formed when expectations influence perceptions

26
Q

Perceptual constancy

A

Perceptual constancy: the process by which we perceive stimuli consistently across varied conditions

27
Q

What is the disclaimer about perceptual sets?

A

A disclaimer: perceptual sets and constancy are just concepts which describe patterns of behavior in relation to sets of stimuli
- They do not provide an explanation of that pattern of behavior

28
Q

Attention - Selective attention

A
  • Selective attention
    ○ The process of selecting one sensory channel and ignoring or minimizing others
    § Assumed to be controlled by the reticular activating system (RAS) and higher cortical regions
29
Q

Attention - Filter “theory” of attention

A
  • Filter “theory” of attention
    ○ Attention is a ‘bottle neck’ through which information passes
    § Dichotic listening: a research design in which subjects have a message delivered to each ear independently through headphones. Both messages are delivered simultaneously, but only the attended ears message is able to be accurately recalled
30
Q

Inattentional blindness

A

Inattentional blindness
- Failure to detect stimuli that are in plain sight when our attention is focused elsewhere

31
Q

Change blindness

A
  • Change blindness
    ○ Failure to detect changes in a visual stimulus
32
Q

Subliminal messaging

A

Subliminal messaging: putting messages into music or other broadcasts that we observe and interpret unconsciously
- It can also be noted that it does not work and that has been proven numerous times over

33
Q

Extrasensory perception (What is it?)

A

Extrasensory perception
- Perception of events outside the known channels of sensation

34
Q

Extrasensory perception - Precognition

A

○ Precognition
§ Predicting events before they occur though paranormal means
□ Eg. What cards will appear

35
Q

Extrasensory perception - Telepathy

A

○ Telepathy
§ Reading others minds

36
Q

Extrasensory perception - Clairvoyance

A

○ Clairvoyance
§ Detecting the presence of objects that are hidden from view

37
Q

Zener cards

A

Zener cards: used to test precognition, telepathy, and clairvoyance
- Used by Rhine

38
Q

Zenner cards results of the Rhine tests?

A

<– the results of the tests
○ They were higher than expected

39
Q

How large must a group of people be before the probability of two people sharing the same birthday exceeds 50%?

A

§ A: 23