Sperry methodological issues
research methods and techniques
types of data
ethical considerations
validity
reliability
sample bias
ethnocentrism
Quasi experiment - good for situations where the IV can not be manipulated
controlled conditions e.g. screen
Used observation within it (observed doing different tasks and recorded responses)
entirely qualitative which gives context to the data (reactions to the visual or the tactile tasks)(verbal responses relating to tasks)
quantitative data would have stated how many of the participants identifies the object
No distress
no deception
protection from harm
informed consent
ability to withdraw
not given debrief as they knew the aim
demand characteristics - knowing of the aims
not ecologically valid (in real world you are not asked to cover one eye)(you use whole visual field) but was okay because Sperry was aware he was studying such a specific area
standardised procedures so could easily be replicated (same time for each image/word shown, same screen)
Not reliable - people had surgery at different times
very small sample (11 people)
2 of which had the procedure a bit of time before the study and the other 9 had it recently
very specific conditions to get the sample
Yes:
No:
sample was small so hard to generalise
Sperry knew it was a very specific condition
only from one place
Done in lab conditions
Didn't get quantitative - more scientific to have that
but could be distressing for the participants to know their brains work differently to normal
participants could change their responses
has ecological validity as uses people with corpus collusm split
mundane realism
Internal validity - done in controlled environment (standardise and structures)
Not all people had the splitting procedure at the same time before the study
There were some exceptions with a small sample so harder to generalise
The image was always presented for 1/10th of a second
always had an eye covered
only American people
lacks generalisability - population validity
physiology for every brain is the same so shouldn't really make a difference
How you are brought up could affect your brain (childhood trauma affects brain development)