I did some research on the attitude, motivation and reflection of students. The first survey was done before any changes.  Half of the class then continued with lectures in a similar way as they did before (>2 months).  The same surveys were repeated after a few weeks and the results show that these students became more negative.  I would expect a very similar result for both surveys since there were no change in the lecturing mode.  Any idea what could be a possible reason for this?