You now have the information, what else do YOU need to make your decision?

YOU- the potential participant needs to be able to not only understand what is being consented to, but also to appreciate the consequences of participating - CAPACITY.

You have the information, you understand and appreciation the consequences,  what else does the person need to be able to make a decision?: you need FREE POWER, the ability to say know.

 FREE POWER : refers to the ability to choose to participate or not to participate.