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Psych2180E > Chp 3 - Perception > Flashcards

Chp 3 - Perception Flashcards

1
Q

Psychophysics

A

the branch of psychology that deals with relationships between physical stimuli and mental phenomena
- stimulus detection
- stimulus discrimination

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2
Q

Stimulus Detection

A
  • What can be sensed or perceived and what cannot be
  • Involves determining sensory thresholds (i.e., the weakest stimulus that a person is capable of perceiving)
  • Stimuli can be supraliminal or subliminal
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3
Q

Sensory threshold

A

the weakest stimulus that a person is capable of perceiving

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4
Q

Just-Noticeable Difference
(JND)

A

the smallest physical
change a person can detect
more than 50% of the time

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5
Q

Stimulus Discrimination

A
  • Amount of difference necessary for a person to perceive the difference
  • Just-Noticeable Difference
    (JND)
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6
Q

Signal Detection Theory

A

Delineates differences among four potential outcomes

signal: present /absent
response: yes/ no

hit/miss/correct rejection/ false alarm

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7
Q

subliminal

A

Less than 50% can be detected

stimuli that are not perceived at the conscious level and thus are not detected are called subliminal

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8
Q

supraliminal

A

Stimuli that are perceived above the threshold and thus are detected at the level of consciousness

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9
Q

Symbolic distance effect

A

2 stimuli can be discriminated more quickly when they differ more on symbolic dimension

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10
Q

Semantic congruity effect

A

the condition in which a person’s decision is faster when the dimension being judged matches or is congruent with the implied dimension.

implied dimension is height for balloon, how high, = congruent
for yoyo, lowness and how low = congruent

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11
Q

Anatomy of the eye (8)

A

→ Iris
→ Pupil
→ Cornea
→ Lens
→ Retina
→ Fovea
→ Blind spot
→ Optic nerve

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12
Q

Sensation

A

registration by the sensory organ (eyes) of a physical stimuli from the environment

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13
Q

Perception

A

subjective interpretation of sensations by the brain
- Perception of vision is not in the eyes, it’s in the brain

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14
Q

lens

A

Take care rest of focus
Fine tuning image based on distance
Change shape to when needed

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15
Q

three layers of neurons of the retina

A
  • rods and cones
  • bipolar cells
  • ganglion cells
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16
Q

What happens after light waves enter the eye?

A
  • light waves enter the eye, are focused and inverted by the lens, and are projected onto the retina
  • rods and cones are stimulated by light, beginning the process of vision. Patterns of neural firing from these cells pass on to a second layer, the bipolar cells.
  • bipolar cells then collect the mesages and move them along to the ganglion cells
  • axon of the ganglion cells converge at the rear of the eye, forming the bundle of fibre that makes up the optic nerve
  • the optic nerve signal exits the eye and continues through various structures, eventually projecting to the visual cortex of the occipital lobe in the lower rear portion of the brain.
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17
Q

fovea

A
  • Central portion of the retina and allows for acute and detailed vision
  • Packed tightly with receptors known as cones
  • Each cone in the fovea has a direct line to the brain which allows the registering of the exact location of input
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18
Q

optic nerve

A
  • Axons of ganglion cells exit through the back of the eye and travel to the brain
  • The point at which it leaves is called the blind spot
  • It contains no receptors
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19
Q

blind spot

A

no rods or cones
Devoted to bundling of the axons in that nerve

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20
Q

ratio of photoreceptors

A
  • rods outnumber cones by a ratio of 20:1 or greater in the retina
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21
Q

Rods

A
  • More numerous than cones
  • Sensitive to low levels of light (dim light)
  • Used mainly for night vision
  • One type of pigment only
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22
Q

Cones

A
  • Highly responsive to bright light
  • Specialized for colour and high visual acuity
  • In the fovea only
  • Three types of pigment
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23
Q

The Periphery of the Retina

A
  • Greater number of receptors called rods
  • Detailed vision is less in peripheral vision
  • Allows for greater perception of much fainter light in peripheral vision
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24
Q

Photoceptors convert signals into _______ _______

A

electrical impulses

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25
Q

Photoreceptors

A
  • Located at the back of the eye
  • Respond to light
  • Sends signals to other cells closer to the eye
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26
Q

4 types of photoreceptors

A

Bipolar cell
Horizontal cell
Amacrine cell
(Retinal) Ganglion cell

27
Q

Bipolar cell

A

Receives input from photoreceptors

28
Q

Horizontal cell

A

Links photoreceptors and bipolar cells

29
Q

Amacrine cell

A

Links bipolar cells and ganglion cell

30
Q

Retinal ganglion cell

A

Gives rise to the optic nerve

31
Q

Vision in New born babies:

A

cones a bit diff: short and fat, less efficient in capturing colour and detail
- Are spread out around the whole retina
- 1 yo is like an adult

Explain bad vision in babies

32
Q

Visible spectrum

A
  • Visible light is a portion of the electromagnetic spectrum
  • The perception of color depends on the wavelength of light
  • Humans perceive wavelengths between 400-700 nanometers (nm)

Humans: most sensitive to shades of green
- Evolutionary useful to look for predators, seek food
e.g. Blue obj: absorbed all wavelengths that are not blue

33
Q

Retino-Geniculo-Cortical-Pathway

A

Left and right LGN

Lateral Geniculate Nucleus (LGN) Contralateral processing, to the vision
Part of the thalamus:
- Specialized for visual perception
-Destination for most ganglion cell axons
-Sends axons to other parts of the thalamus and to the visual areas of the occipital cortex

Each side send sig contralateral/ ipsilateral

Primary Visual Cortex (V1)
Receives information from the lateral geniculate nucleus and is the area responsible for the first stage of visual processing

Damage to V1 show blindsight
- an ability to respond to visual stimuli that they report not seeing

34
Q

The ventral stream

A

The ventral stream refers to the path that goes through temporal cortex

The “what” path

Specialized for identifying and recognizing objects
damage to ventral stream↔can’t identify objects (visual-form-agnosia)

35
Q

The dorsal stream

A

The dorsal stream refers to the visual path in the parietal cortex

The “where” path

Important for spatial perception, vision for action

Damage to dorsal stream↔don’t know where an object is in space (optic ataxia)

36
Q

Bottom-up processing

A

emphasizes basic components
of a stimulus so recognition is influenced by the pattern
of incoming information

37
Q

Top-down processing

A

emphasizes prior knowledge and
expectations for recognition

38
Q

Gestalt Psychology

A

Gestalt: word for configuration
Law of Pragnanz
Law of similarity
Law of Proximity
Law of Good Continuation
Law of Closure

39
Q

Necker cube

A

2 shaded version, 2 possible ways to view

40
Q

Law of Pragnanz

A

We will interpret things in the simplest manner possible

Like to simplify, as it helps relieve cognitive load

41
Q

Law of similarity

A

Tend to see items similar as a singular unit,

e.g. we see 2 columns of circles and triangles, instead of thinking of 16 shapes

42
Q

Law of Proximity

A

Perceive as singular unit when close to each other

43
Q

Law of Good Continuation

A

Visual systems perceives continuation

44
Q

Law of Closure

A

Don’t need a shape to be completely encloses to view a shape

45
Q

Figure-Ground

A
  • Ground extends behind the figure
  • Border ownership: borders belong to figure

How do we view a scene?
How to decide what is in the foreground vs. Bg
- Contrast between light and dark

46
Q

Audition

A
  • sound waves being sensed
    • Vibration-induced changes in pressure of molecules through a medium
47
Q

The ear main structures (7)

A

→ Pinna*
→ Eardrum*
→ Malleus*
→ Incus*
→ Stapes*
→ Cochlea*
→ Basilar membrane

48
Q

Organ of Corti

A
  • Rests on top of the basilar membrane
  • Contains ~16,000 “hair cells” that are responsible for sensory transduction
    Transfer sounds from basilar membrane to auditory cortex
49
Q

The middle ear when sounds come in:

A

Make eardrum vibrate for sounds, at the same frequency
When vibrates, initiate movements in the middle ear

3 bones
-Incus
-Malleus
-Stapes

Transfer the sound into inner ear

50
Q

Where does sensory transduction occur?

A

The cochlea of the (inner) ear

51
Q

Basilar membrane

A

Layers the cochlea, frequency specific
-Will stimulate specific spots acc to frequency

Every single part of the BM (b4 the sound to be stimulated) will be stimulated regardless, over time, higher pitched harder to hear due to them being in the outer loop of the cochlea

52
Q

How does sensory transduction occur?

A

Basilar Membrane
- Sheet of tissue running the length of the cochlea
- Frequency of the wave will cause
- maximum displacement / movement in different parts of the basilar membrane!
- High frequencies near the thicker, narrower base, lower frequencies near the thinner, wider apex

53
Q

Basic properties of sound waves

A
  • frequency = pitch (Hz)
  • amplitude = loudness (dB)
  • waveform
54
Q

Frequency (Hz)

A

Compression: peaks and the troph

If I have a 1000 wavelength in 1s = 1000hz

Higher pitch= more wavelengths per sec

55
Q

Human Audition

A

e.g. ultrasounds we cannot hear

Anything lower (decible lvl) than our threshold, we can’t hear it

Our voices are the focal point for listening

56
Q

Synesthesia

A

A set of experiences in which input
from one sensory system produces a conscious
experience not only in that sensory modality but
also in another.
* Projective Synesthesia
* Associative Synesthesia

57
Q

Synesthesia tend to be related to ________

A

People with misophonia are affected emotionally by common sounds — usually those made by others, and usually ones that other people don’t pay attention to. The examples above (breathing, yawning, or chewing) create a fight-or-flight response that triggers anger and a desire to escape.

58
Q

Grapheme-Color Synesthesia

A
  • see indiv letters as colour
  • Only goes in one direction, e.g 9 is orange, but orange doesn’t remind them of 9
  • More common in women than men
    Visual Search
    Synesthetes show response time profiles that are consistent with “pop out” color effects
  • Some do better on memory tests, as mem is mostly association
59
Q

Associative Synesthesia

A

Feeling of connection, e.g. might hear the violin, connects to the colour yellow, but can’t see it

e.g cello sounds blue

60
Q

Projective Synesthesia

A

Tend to think of, e.g. see particular colours when one modality is stimulated

61
Q

Cross-modal Perception

A

e.g. at the movies, the audio comes from the speakers, but the visual info makes the sounds look like it comes from the screen

e.g. lipsyncing
How does the gesture of the marimba player affect the perception of the length of a note?

People to judge the length of the notes played without seeing it (think all the notes are the same length)

VS. Seeing: long gestures/short, length perceived as longer/ shorter, although it is still the same

62
Q

Affordances

A
  • The sense of action possibilities
    inherent in what we perceive.

Each thing in the room makes us think of the action potential.

e.g see a chair, perceive as sth that affords me the opportunity to sit

e.g. for a small child, chair affords the opportunity to crawl under

63
Q

Template

A

A model or pattern
- theories of pattern recognition, template is the pattern stored in memory agains which incoming stimuli are compared to recognise the incoming patterns

Psych2180E (8 decks)

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