I think there's a mental toll which will marinate the longer a streak goes on. The expectation and desire to keep the run going becomes more and more amplified at the expense of the 'one game at a time' mantra which characterises the early part of the sequence. Then a shit result comes along. So the preceding results do have an impact to some extent imo.
I distinctly remember an inexplicable defeat at home to a shit Blackburn under Rafa which lost us some record.