The shrink is just supposed to give you unbiased feedback and then give the interviewers some prompts to clarify any potentially weak areas. Let's face it some of the questions are obvious. Have you ever got confused about right or left looking in a mirror? No.......Liar.
You will not fail your assessment if you are an A1 guy throughout the rest of the process unless they think you are an axe-murderer or racist. Some of the shrinks however go beyond their remits and start interviewing you. Do you feel stressed etc? Pretty bloody obvious you are as you are at an interview. Do not feel the urge to pour your heart out!
I have done 5 since I have been in the company and they have all turned out remarkably skewed in favour of the jobs I have been applying for. I must suffer from multiple personality disorder that is affected by what I think they are looking for.