Perception can affect our critical thinking in a negative way. Critical thinking depends on having high quality information about which to think. If our perception gives us bad information to think about, the quality of our thinking will suffer. We, as human beings, are very susceptible to perceiving things in wrong ways. We can be fooled by our physical senses. We can also perceive things in incorrect ways because we filter them through prejudices and emotions that we do not even realize that we have.
Critical thinking depends on high quality information. If our perception does not give us accurate information, it makes it harder for us to think effectively.