Biopsychology ( Research )

Question 1

Campbell & Murphey et al

Answer 1

• Woke up 15 ppts at various times and shone a bright light on the backs of their knees
  -Caused disruption of upto 3 hrs to sleep/wake cycle
• Light doesnt rely on eyes to effect SCN

Question 2

Miles et al,

Answer 2

• Case study of man blind from birth whose sleep/wake cycle of 24.9 hrs couldnt be entrained using social cues
• Shows social cues alone are not effective in resetting biological rhythms

Question 3

Draganski et al.

Answer 3

• imaged brains of medical students 3 months before and after their final exams
• Learning induced changes found in prosterior hippocampus and parietal cortex

Question 4

Maguire

Answer 4

• Found significantly higher volume of grey matter in prosterior hippocampus ( associated w/ spatial & navigational skills ) compared to control group

Question 5

Siffre

Answer 5

• Spent 2 months in cave deprived of natural light
• Sleep/ wake cycle adjusted to 25hrs

Question 6

Folkard

Answer 6

• 12 ppts in cave for 3 months
• Went to bed when clock said 11:45 pm and woke up at 7:45 am
• Researchers gradually sped up clock to 22 hour day
• Only 1 ppt comfortably adjusted

Question 7

Decoursey

Answer 7

• Removed SCN of 30 chipmunks
• Observed for 80 days
• Their sleep/ wake cycle disappeared and many were killed by predators

Question 8

Ralph et al.

Answer 8

• Bred ‘mutant’ hamsters w/ 20hr sleep/wake cycle
  -SCN of ‘mutant’ hamsters transplanted to normal hamsters
• Hamsters developed cycles of 20 hours

Question 9

Stern & McClintock

Answer 9

• 29 women w/ irregular periods
  -Pheremones taken at different stages in menstrual cycle w/ cotton pad
• Cotton pads were then cleaned and rubbed on upper lips of other ppts
• 68% of women experienced changes to their cycle

Question 10

Aschoff & Wever

Answer 10

• Ppts spent 4 weeks in underground WW2 bunker
  -All but 1 displayed circadian rhythm between 24-25 hours

Question 11

Sperry

Answer 11

• 11 epileptic ppts
• 2 Hemispheres surgically seperated by removing corpus callosum
• image shown to RVF ( processed by LH)
• same of diff imagine shown to LVF
• ppts could describe object shown to RVF
• LVF :
• cannot name object
• can select matching object behind screen using left hand
• can select object closet associated w/ picture
• pinup shown to LVF, ppt giggled but reported seeing nothing

Shows LH is verbal and RH is silent but emotional