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Psych 10 > Week 4 > Flashcards

Week 4 Flashcards

(42 cards)

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1
Q

Sensation & transduction

A

Sensation: Stim of sense organ

Transduction: receptors convert physical from environment to signals for brain to interpret

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2
Q

Perception

A

Interpretation of a sensation –> mental representation

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3
Q

Sensory adaptation

A

Sensitivity to prolonged stim tends to decline over time as one adapts to current conditions

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4
Q

Psychophysics

A

Study of how physical stim affect the senses

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5
Q

Absolute threshold

A

Minimal intensity needed to barely detect a stim 50% of the time

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6
Q

Sensitivity

A

How responsive one is to faint stim

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7
Q

Acuity

A

Differentiating btw two stim (e.g. two similar tones)

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8
Q

Just noticeable difference (JND)

A

Minimal change in a stim that can barely be detected

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9
Q

Weber’s law

A

Amount of change needed for change to be noticed is constant ratio of the original stim

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10
Q

Signal detection theory

A

Response to a stim depends on person’s sensitivity to stim and a person’s decision critereon

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11
Q

How is light interpreted in the eye?
(keywords: cornea, pupil, iris, lens, accommodation, retina, photoreceptor cells, optic nerve)

A

1) Light passes through CORNEA (clear protective layer around eye)
2) Light passes through PUPIL (hole in the IRIS, the colored part of the eye that controls how much light is let in)
3) Light passes through LENS, which is shaped by eye muscles so the light is focused on the RETINA in a process called ACCOMMODATION (lens flatter for objects further away, lens more curved for objects nearby)
4) Retina lined with PHOTORECEPTOR CELLS called RODS and CONES
5) Signals from rods and cones transducted to brain via the OPTIC NERVE (OPTIC DISK is the beginning of the nerve in the eye)

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12
Q

Myopia vs hyperopia

A

Myopia/nearsighted - eyeball too long –> image focused in FRONT of retina

Hyperopia - eyeball too short –> image focused BEHIND retina

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13
Q

Rods

A
  • Peripheral and night vision, brightness
  • More rods than cones (~120M rods)
  • Distributed evenly in retina except for area in the macula called the FOVEA
  • No rods in fovea –> reduced clarity in low light but increased sensitivity to light in periphery
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14
Q

Cones

A
  • C words - “Clarity and Color”
  • ~6M cones; concentrated in the FOVEA but sparse in macula/retina –> we see things much clearer if we look right at them
  • 3 different cones for 3 different wavelengths: L-cones (long - red), M-cones (medium - green), S-cones (short - blue)
  • Missing cones –> color blindness
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15
Q

Trichromatic color theory

A

We perceive color by combining RGB wavelengths

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16
Q

Color-opponent system

A

Pairs of cone types work against each other

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17
Q

What causes negative afterimages?

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A

Opponent process theory: cones are together in opposing pairs: red/green, yellow/blue, black/white
- Cells stimulated by green inhibit the cells stimulated by red
- When changed, the previously inhibited red cells fire, while the green PREVIOUSLY-stimulated cells are tired and don’t fire –> we see red

18
Q

Neurological pathway from photoreceptor cells to brain

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A

rods/cones –> bipolar cells –> retinal ganglion cells –> lateral geniculate nucleus (part of thalamus) –> area v1 –> other parts of the brain

NOTE: bunded RGCs form the optic nerve

19
Q

Dorsal vs ventral vision pathways + purpose

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A

Dorsal: “where” – where an object is and its movement; upper pathway to parietal lobe

Ventral: “what”/”how” – shape and identity of an object; lower pathway to temporal lobe

Purpose: Neurons in area v1 only perceive small details like edge –> signals to regions farther from V1 respond to more complex features

20
Q

Visual agnosia vs prosopagnosia

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A

Visual agnosia: inability to recognize objects

Prosopagnosia: inability to recognize faces

21
Q

Patient DF

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A

Injured ventral stream –> couldn’t recognize objects

22
Q

Bottom-up processing

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A

Sensory receptors pick up signals and send them to the brain

23
Q

Top-down processing

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A

Perceiving things based on your prior knowledge of the world

24
Q

Monocular/pictorial depth cues

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A
  • Can be seen w one eye
  • Linear perspective/vanishing point, light and shadow, interposition, relative height, relative size, texture gradient
25
Binocular depth cues
- Both eyes - RETINAL DISPARITY - two retinas have slightly different views of the world - CONVERGENCE - when a person perceives an object as close, eye muscles make the eyeballs turn in more -- brain perceives
26
Perceptual constancy
Even as aspects of sensory signals chance, our perception of it doesn't
27
Conceptual knowledge
- When we perceive an object, we not only recognize what it looks like but also what it is/what it's doing - Ex: when we see a car coming towards us we not only recognize it as a car but also that it's metal, it could hurt us, it's moving fast, etc
28
Perceptual organization
Process of grouping or segregating features to organize objects
29
Perceptual grouping rules
PSSCCC - Proximity: objects grouped together are associated w each other - Simplicity: simplest interpretation of objects - Similarity: similarities in texture, shape, etc - Continuity: tend to group objects w good continuation (edges or contours w same orientation) - Closure: fill in missing gaps of visual scene - Common fate: elements of a visual object moving together are perceived as parts of a single moving object
30
Change blindness vs inattentional blindness
Change blindness: fail to notice change in visual scene Inattentional blindness: fail to perceive objects not the focus of attention
31
Muller-lyer illusion
Length of a line appears to be dependent on the orientation of arrows
32
Carpentered world hypothesis
prev experience w corners plays role in the strength of muller-lyer illusion
33
Point of subjective vs objective equality
Point of subjective equality: Point at which the two lines APPEAR equal Point of objective equality: point at which the two lines are ACTUALLY equal
34
How are sound waves interpreted as sound in the brain? (keywords: pinna, auditory canal, eardrum, ossicles, cochlea, basilar membrane, inner hair cells)
1) The PINNA collects and channels sound waves into the AUDITORY CANAL, which funnels sound into the EARDRUM 2) The EARDRUM vibrates in response to the soundwaves 3) The OSSICLES (3 bones -- hammer, anvil, and stirrup) amplify the vibrations to the COCHLEA 4) The COCHLEA converts the vibrations into neural impulses - Cochlea divided by structure called BASILAR MEMBRANE -- low frequency = tip moves, high frequency = base moves - Basilar membrane moves up and down --> moves cochlear fluid --> stimulates INNER HAIR CELLS 5) INNER HAIR CELLS (specialized auditory receptor neurons located on basilar membrane) send signal to auditory nerve --> thalamus --> A1 (temporal lobe) - Some evidence also suggests dorsal and ventral auditory streams
35
McGurk effect
Speaker’s lip movements influence what sound is heard
36
What are the physical dimensions of a soundwave
Frequency: pitch -- measured in hz Amplitude: intensity/loudness -- measured in dB Complexity: influences measure of timbre (quality that lets you differentiate btw note on piano vs guitar, etc) -- mixture of soundwaves
37
What are the different parts of the outer ear, middle ear, and inner ear?
Outer ear: pinna, auditory canal, eardrum Middle ear: ossicles (hammer, anvil, stirrup) Inner ear: cochlea (contains basilar membrane + inner hair cells), auditory nerve
38
How is pitch signaled to the brain (2 "codes")
Place code: brain uses relative activity of hair cells across whole membrane to determine pitch Temporal code: brain uses timing of APs to determine pitch
39
How is loudness signaled to the brain
Total amount of hair cell activity
40
How is timbre signaled to the brain
Relative activity of hair cells
41
How is location signaled to the brain
Binaural cues: sound arrives at one ear sooner than the other + sound will be more intense in one ear than the other
42
Conductive vs sensorineural hearing loss
Conductive hearing loss: damaged eardrums or ossicles; can be corrected w surgery Sensorineural: damage to inner ear; sensitivity and acuity decrease; hearing can help w sensitivity issues but not accuity

Psych 10 (12 decks)

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