Martin forgot that he needed to turn over the chicken in the oven but remembered that his grandson's birthday is the next day. This is an example of:

- Prospective-memory paradox.

Explanation:

'Prospective-memory' is described as the recalling or remembering the planned or proposed actions that are to be done in the future. 'Prospective - memory paradox' would be illustrated as the paradox or inconsistency in prospective memory that invites age-related deficit in remembering the intended actions.

As per the question, Martin's situation is exemplifying the 'prospective-memory paradox' as it involves a self-contradictory deficit because Martin forgets to turn over the chicken but remembers well his grandson's birthday. This illustrates the 'inconsistency' of his memorization. Thus, 'prospective-memory paradox' is the answer.