Parental consent: used for research involving children. Aim to get assent from the child as well.
Presumptive consent: from someone else with a similar background or someone who knows the participant.
Prior general consent: consent obtained before the study, without detailed knowledge of what will happen.
Retrospective consent: obtaining consent afterwards. (only if no alternative procedure available).Used with presumptive consent.
Without consent the participant may display demand characteristics.
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