What research has investigated the influence of 'spoon-feeding' on learning?
By 'spoon-feeding' I mean providing extensive information about topics that will be assessed. ThisThis related question discusses one example, which is the provision of model solutions to maths problems, after grading.
A quick search reveals a few articles, blogs and forum posts, which offer opinions along such lines as spoon-feeding being less effective because of not engaging students' interest, or because of not encouraging critical thinking, problem-solving, research, and so on.
My question is whether any serious research has investigated the outcomes of spoon-feeding. For example, some research might have found an optimum amount of information that ought to be provided to students to maximise their performance in assessments as well as their ability to solve problems for themselves.