lecture 7- variation in cerebral asymmetry

Question 1

cofabulation in split brain patients

Answer 1

• spontaneous production of false memories.
• cant explain why they chose something so “memory” brings up something to make sense of it.
• not lying = low level of awareness

Question 2

aphasia
apraxia
-consequence of what damage?

Answer 2

• aphasia: perceiving/ expressing language
  apraxia: gesturing associated with language.
• almost always consequence of LEFT hemisphere damage

Question 3

hemineglect & prosopagnosia

• what damage?

Answer 3

• neglect = cant see part of VF. usually LVF.
• inability to see faces

consequence of RIGHT hemisphere damage

Question 4

similar injury, differences in symptoms - why?

Answer 4

age, handedness. => cause different organization in brain.

Question 5

Left-handers Cerebral organization

• speech lateralization?
• larger incidence in ?? ppl

Answer 5

• left lateralized speech.
• left-handed larger incidence in mentally disabled children & neuro disorders.
  LH damage = (control Rhand) plasticity, more right handers swtich to L than Lhand switch to R.

Question 6

theories of hand preference

Answer 6

behavioural utility
environmental reinforcement
environmentall acident

Question 7

behavioural utility - hand preference theory

Answer 7

left hand for shield or for holding baby close to heart. other hand for other tasks = became dominant.

Question 8

enviro reinforcement

Answer 8

hand preference theory:

bias in enviro - learning kinda pushes for Rhand bc everything is “made” for Rhand.

Question 9

Enviro accident

Answer 9

hand preference theory:
genetic bias toward Rhand.
Lhand thru cerebral deficit
twin study: more left hand & neuro disorder - bonk heads in utero.

Question 10

finger tapping experiment

- speed vs hand?

Answer 10

dominant hand faster than non-dominant

Question 11

gender differences in cerebral organization

• motor skills
• spatial analysis
• mathematical aptitude
• perception

Answer 11

• motor: men throw,intercept. W: fine motor.
• spatial: M-mental rotation, spatial navigation. W: spatial memory, landmarks and changes in enviro
• Math: M:reasoning; W: computation [distn is sketchy tho]
• percpetion: Q: more sensitive to stimuli except vision (equal) M: drawing mechanical objects - maybe stereotype threat

Question 12

established asymmetry

• Left planum temporale
• sylvian fissure
• planum parietale
• interhemispheric connections
• fingerprint asymmtery

Answer 12

• LPT: larger in males compared to RPT
• Males = larger asymmetry in Sylvian. more horizontal in LH, more vertical in RH
• PP: 2x as large in males
• IC: females 4x more
• females - atypical fingerprint asymmetry

Question 13

verbal IQ vs performance IQ

Answer 13

females - greater average verbal IQ with Rlesion. lower with Llesion.