W2L2 - Neural mechanisms of face perception in humans and non-humans Flashcards

1
Q

Evidence for face neurons from human adaptation

A
  1. ) Face Adaptation of Neurons (neurons adapted to see faces)
  2. ) Bistable perception (See one face then other)
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2
Q

What are the 3 studies of neural mechanism of face-processing in non-human primates

A
  1. ) Single Cell
  2. ) fMRI
  3. ) Microstimulation
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3
Q

Single Cell Study in face-processing in non-human primates

A

Neurons show preference for faces in IT

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4
Q

fMRI study in face-processing in non-human primates

A

“Face Area” in Macaques:

Recorded 400 cells in “face area” (identified by fMRI) and 97% of visually responsive neurons responded to faces.

Apple and clock showed some response (roundness? property of faces?)

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5
Q

Micro-stimulation in face-processing in non-human primates

A

Stimulated neurons in IT and influence face/flower perception.

Stimulate > Higher likelihood to see faces at all noise
No stimulate > Equal probably to see face/flower
> Stimulation effect greatest for face-selective cells

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6
Q

Human Studies for face-perception and neural. What do they use

A
  1. ) MEG

2. ) fMRI

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7
Q

MEG Study for face-perception in humans neural.

A

MEG (Cross of EEG and fMRI)

Temporal responses for faces consistently higher M170. No significant difference between cars and shoes for experts

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8
Q

fMRI Study for face-perception in humans neural.

A

FFA responded more:

(1) Intact Face > Two-Tone Face
(2) Faces > Houses
(3) 3/4 Face > Hands

FFA: Holistic; LOC (Lateral Occipital): Changes in Parts

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9
Q

fMRI Study for face-perception in humans neural. What happens to bistable stimuli and FFA

A

Bistable Stimuli: FFA more active when a face is perceived

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10
Q

What are neural evidence to suggest FFA is related to level of expertise

A

FFA activation for face, CAR, BIRD experts in FFA

Car expert no FFA for bird object, vice versa

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11
Q

Why are cars,birds,dogs criticized for using as expert for face-perception.

A

They do not have face-like properties (Similar features arranged in similar configurations; Recognition at subordinate level; Stimuli for which participants are experts)

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12
Q

What happens when greebles become experts in FFA

A

FFA change and whole part effect demonstrated AS A RESULT of expertise

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13
Q

Comparative fMRI: Human v Macaque

A

Activate the same areas

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14
Q

Face Perception: 8 Epilepsy Faces Single Units

A

Single units responded not only to faces, but familiar faces such as Halle Barry
> Not only face information, but identity

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15
Q

Face Perception: fMRI + ECoG

A

Category-selective response in ventral temporal cortex (VTC)
Using High Frequency Broadband (30-160HZ), strong positive correlation between fMRI and ECoG signal. Tighter for faces than houses

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16
Q

What happens with FFA is electrically stimulated

A

EBS of right FG: Distort Face

EBS of left FG: Distort non-specific Visual Changes (e.g. color)