Biological - Sperry

Question 1

background

Answer 1

.Sperry worked on rats/salamanders
.Cut optic nerves and rewired brains so they would see upside down or move wrong side of body
.thought split brain surgery patients were perfect for testing what each hemisphere did

Question 2

aim

Answer 2

to study functions of separated and independent hemispheres

Question 3

contralateral control

Answer 3

each hemisphere controls opposite side of the body

Question 4

sample

Answer 4

11 patients who’d had SBS - then compared to those who hadn’t
2 (4/5 years ago) vs 9 recent surgery
America
opportunity sampling

Question 5

type of experiment

Answer 5

quasi experimnet

Question 6

IV

Answer 6

split brain or not

Question 7

DV

Answer 7

ability on tasks

Question 8

apparatus

Answer 8

.translucent screen for items to be presented behind

.items that were placed behind screen

Question 9

visual task procedure

Answer 9

.one eye covered and asked to look at fixation point
.stimuli presented for 1/10 of a second to one or both sides of fixation point
.presented quickly to just allow 1 VF (1 HS) to pick it up
.participants asked to name object, draw it, or pick it up from a selection on the desk

Question 10

visual task results

Answer 10

LVF (RH): couldn’t name it, could draw it, could select it

RVF (LH): could name it, could identify from pics, could select from table of items

Question 11

visual task conclusions

Answer 11

LH = language, can identify objects
RH = doesnt have language

Question 12

visual task further test

Answer 12

.RH could solve simple math problem = has maths ability

.RH would laugh at nude pin up, but couldn’t name what they saw = RH has second conscious entity

Question 13

tactile task procedure

Answer 13

.participants had hands shielded from view

.asked to pick up an object with one hand and say what it was

Question 14

tactile results

Answer 14

LH: could name item
RH: couldn’t name item, consciously unaware of it

Question 15

tactile conclusions

Answer 15

LH: clear identification ability
RH: no language ability

Question 16

Overall results

Answer 16

LH/RVF is responsible for language

RH/LVF can communicate nob verbally, but cant report seeing material verbally

Question 17

controls

Answer 17

items/symbols displayed
fixation point
1/10 second for seeing item
hands out of view
one eye covered
tachistoscope

Question 18

tachistoscope

Answer 18

device that displays an image for a set amount of time

Question 19

internal reliability

Answer 19

yes - highly controlled

Question 20

external reliability

Answer 20

no - only 11 people so no consistent effect

Question 21

internal validity

Answer 21

yes - highly controlled, lab experiment

Question 22

population validity

Answer 22

no - ethnocentric (only Americans)

yes/no - only split brain surgery patients

Question 23

ecological validity

Answer 23

no - don’t often close eyes/not see your hands

usually see image for longer than 1/10 second

Question 24

ethics kept

Answer 24

deception
informed consent
protection from harm
confidentiality

Question 25

ethics broken

Answer 25

debriefing