Glossary of Lecture 14 Psych 345

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What were the 3 necessities for tachistoscopic hemifield presentation:
1. Individual fixates centrally
2. Rapid presentation: under 150ms so eyes don' move, want stimulus on and off screen in time frame so eyes don't move and each hemi doesn't see
3. Unimanual response: pick w/ one hand what was seen

Unimanual response: R hemi uses __ hand (___ response) output directly from hemi __
left, contralateral, interogating
The tachistopic method cannot do ___ showings of clips/film b/c if eyes __ info not ___ to one hemi
complex, move, isolated
Z Lens:
one eye is patched, lens on the other eye allows image only to one hemiretina
Z lens: the CC is severed but __ __ intact, need to stimulate one ___ and other eye __, info only to the __ hemi of the eye
optic chiasm
hemi retina

5 parts of Human Disconnection Syndrome:
1. visual-verbal disconnection
2. tactile-verbal disconnection
3. visual-visual disconnection
4. tactile-tactile disconnection
5. motor disconnection

Visual verbal disconnection experiment:
Pt look at image of fork and key in sep hemi: Key in R hemi, fork in L hemi
Experimenter: say what you see - only see a fork
Why is there visual verbal disconnect?
L hemi: dominate for speech, only hemi that can access speech
cannot get verbal info of what R hemi experiences/thinks
Does R hemi have cognition?
Yes: Show R hemi pic of ball in LVF, left hand can reach for it though manual response don't see anything
Yes: has some recognition of object and can make associations, something related/draw associations - there is complex processing
R hemi able to read __ words and understand __ by experimenter
simple, request
Tactile verbal disconnection:
cannot name object held in L hand, but doesn't mean don't know object, can pick it from an array of words
Normal brain: tactile-verbal disconnect "knight"
Word in LVF, RH cannot speak but info shared to the other hemi
Shared along many points of the CC: both hemi interpret word in parallel
Complete split: tactile-verbal disconnect "knight"
Info totally isolated in the R hemi
Respond didn't see anything when test L hemi b/c cannot access R hemi
Partial split: tactile-verbal disconnect "knight"
L hemi: no copy of the sensory info b/c pathway for shared sensory info gone
Some semantic association and shared-meaning and impression of the stimulus
Problem solving b/c has semantic transfer to L hemi but basic sensory info gone

Visual Visual disconnection:
cannot match stimuli b/w 2 VF
Task to say if objects match (1 LVF, 1 RVF) perform at chance
Strategic cooperation:
possible for 2 hemi to cooperate: explained in context of every day life behaviors, how get 2 hemi to communicate though CC gone
Example of strategic cooperation:
Task: indicate whether number of dots totals +/- 5, use both VF, have to somehow get info from both VF together
4 ways split brain pts may use strategic cooperation:
1. L hand (Rhemi) tap the number of dots to R hand(Lhemi): use body as external medium to communicate to other hemi
2. Tapping object w/ left hand so auditory sound in both hemis
3. Tongue movement: yes/no responses, yes tongue at roof of mouth, no tongue bit
4. Subvocal info: not audible, L hemi mouth sommething R Hemi

Mouth is a __ organ meaning sensors on both __
midline, hemis
Why do strategic cooperation strategies work?
both hemi have access to the info

Dominate L hemi for:
motor control of right hand
Non dominate R hemi for:
visuo-spatial skills and problem solving
Parietal damage is __ __ which is evident in split brain
constructional apraixa
Pre operation and post what is the L hand like for 3D images?
Pre op: perspective and knowledge of 3D shape, access to visuospatial skills
Post op: not as motor control skills but still perscpective of 3D shape b/c R hemi
R hand for pre op and post op 3D images:
Pre op: Perspective and knowledge of 3D shape, access to the R hemi
Post op: No perspective of 3D shape in the R hemi

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