1. fear, amyg and role of spatial attention

Question 1

prev: whalen and morris conclusions

Answer 1

dissociation between the left and right amyg / ventral more dorsal (SI/BF) in the processing of emotionally valent stimuli when conscious/unconscious

v/right amyg: unconscious autonomic processing of neg valenced stimuli - rought low road

d/left amyg: conscious, explicit, pos and neg processing of stimuli valence and arousal - link to vigilance and cog processing

Question 2

whalen exp 3 eye whites

METHOD

Answer 2

how can fear expressions be processed rapidly in the low route?

wide eye expression - cue for fear/suprise

backwards masking of eyewhites - normal and inversed

Question 3

Whalen exp 3 eye whites

RESULTS

Answer 3

sig increase in BLN (v)of Amyg to eye whites

not present for inverse

BLN sensory input/processing specifically to fear cue

Question 4

layers of the LGN of thallamus

Answer 4

mago and parvocellular
process different levels of contrast of incoming sensory info
magno: crude, projects to the visual cortex and amyg
parvo: detailed

Question 5

vuillemier
magno vs parvo difference

METHOD

Answer 5

fmri
changed spatial freq (detail at boundaries) of images of fear and neutral faces
HSF/LSF

Question 6

neural pathways sensitive to HSF

Answer 6

ventral cortical visual stream via parvocellular channels

fine res, slow response

Question 7

neural pathways sensitive to LSF

Answer 7

dorsal parietal stream + subcortical regions via magnocellular

lower res, rapid

Question 8

vuillemier
magno and parvo

RESULTS

Answer 8

greater response to HSF project more to ventral extrastriate areas that subserve fine perceptual shape-analysis

LSF in processing of fear expression - sig activation in BLamyg a significant response to fear
+
greater response to LSF in bilateral parieto-occipital and retrosplenial cortex- LSF inputs project more to the dorsal visual stream.

Question 9

vuillemier et al
mago and parvo

results explanation

Answer 9

dissociation between amygdala and extrastriate visual cortex, across spatial frequency ranges for face stimuli.

fusiform cortex encode + maintain a representation of fine-grained HSF information

amygdala selectively driven by coarse LSF cues

visual inputs to the amygdala partly distinct from those to ventral extrastriate visual corte