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Perception Exam 3 > Perception and Senescence > Flashcards

Perception and Senescence Flashcards

1
Q

Describe scanpaths of 1 and 2 months old and then an adult

A

1 month: 1st edge they see
2 months: start looking at inner details to identify
Adult: Look at central features to identify face

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2
Q

Where is the damage on the brain that causes prosopagnosia

A

Fusiform face gyrus (V4/IT)

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3
Q

What would you notice on a DTI MRI of someone with prosopagnosia?

A

Smaller inferior longitudinal fasiculus (ILF)

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4
Q

How else can someone with prosopagnosia identify a person

A

Hair style, Clothing, voice

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5
Q

True or false: Even a person with mild or moderate prosopagnosia will never recognize a face

A

False - mild or moderate can recognize with enough exposures

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6
Q

True or false: People with prosopagnosia only have trouble with faces

A

False - also cars and dog breeds. Anything where you’re only looking at a few same components to identify

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7
Q

Tell me about the Grandmother cell theory and if it’s accurate

A

Says that each face occupies one neuron. Not accurate anymore. Found that a face will activate the same combination of neurons though

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8
Q

Diseases that can lead to prosopagnosia?

A

Williams syndrome

Aspergers

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9
Q

How do you test for prosopagnosia?

A

Test using CG faces

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10
Q

True or false: Congenital prosopagnosia is common whereas acquired is not

A

True

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11
Q

What neurotransmitter causes decrease in vision with senescence?

A

Decrease in GABA

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12
Q

What’s affected by aging?

A 
Dark adaptation 
Color vision
Central vision
Stereopsis
Flicker
Motion
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13
Q

What age does dark adaptation, color vision and stereopsis begin to falter?

A

Dark adaptation and stereopsis = 75ish

Colorvision totally gives out at 90ish

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14
Q

How much do pupil sizes change with age?

A

0.5mm per decade of life

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15
Q

How much worse is contrast sensitivity in older people?

A

3x worse than young adults

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16
Q

How much worse is stereopsis in older people than younger people?

A

1/2 as good as it used to be

17
Q

If epileptic, why will you be more likely to get a decrease in motion perception when younger

A

Decrease in GABA for epilepsy!

18
Q

What’s allesthesia?

A

See an object in blind field

Strange diplopia

19
Q

What lobes account for allesthesia

A

Parietal if Balint’s syndrome

Occipital lobe

20
Q

What’re the types of positive spontaneous visual phenomena

A

Allesthesia, visual distortion, kinetopsia, palinopsia and polyopia, phosphenes and photopsias, formed hallucinations

21
Q

What’s visual distortion? What lobe do they occur in?

A

Alice in wonderland syndrome
Micropsia and teleopsia (Parietal)
Macropsia and pelopsia (Temporal)

22
Q

What’s kinetopsia?

A

When you see movement that doesn’t exist. Can be in formed (rotating snakes) or unformed patterns (Migraine aura)

23
Q

What’s palinopsia?What about polyopia? Where do these hallucinations come from?

A

Palinopsia: See things that should be gone from scene
Polyopia: see multiples of things. Can lead to trails of object
Caused by drug Trazodone

24
Q

Phosphenes and photopsias

A

Phosphenes are unformed color/light blobbies

Photopsias are structured/tend to have a pattern

25
Q

Causes of visual hallucination?

A 
Dementia
Seizure
Drugs
Parkinsons
Sleep deprived
Psychotic
Charles Bonnet
26
Q

Why does dementia cause hallucinations?

A

Poor perfusion. Just like with coffee

27
Q

What’re hypnogogic and hypnopompic effects and what do they relate to?

A

Seizure induced hallucinations that happen right before sleep (Hypnogogic) or after waking (Hypnopompic)

28
Q

What disorders cause hallucinations by causing decreases in dopamine?

A

Drugs (esp meth) Sleep deprivation

29
Q

Why do you get hallucinations with parkinsons?

A

Poor fixations cause brain to do magic eye effect with world

30
Q

Who typically gets Charles Bonnet syndrome?

A

Blind individuals

31
Q

What causes psychotic hallucinations?

A

Increase in NTs

Perception Exam 3 (5 decks)

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