You all probably know the thought experiment, 'If a tree falls in the forest and no one is their to hear it, does it make a sound?'. But if we take that one step further and ask 'If we are not consciously aware of a sound do we hear it?'. This question as it stands is very broad so let me specify what I mean.
By consciously aware I mean that we are actively thinking about that sound when it occurs and by hear I mean at some later time, (perhaps with prompting) are you able to recall that there was a sound?
(Of course the question can be phrased not just concerning hearing but also things like pain, etc).