ao3 most studies were filmede observations in labs
Means that other activity that might distract a baby can be controlled
Means observations can be recorded and analysed later
So unlikely that researchers will miss seeing key behaviors
Filming means that more than one observer can record data and establish their inter-rater reliabilty of observations
Babies don’t knpw their observed – so behaviour doesn’t change in response to observation
This is the main problem for over observations
.. therefore data collected in such research should have good reliability