I don't really have any specific way of guarding against cognitive bias myself, other than trying to think carefully and spend time in honest introspection. But it may at least be useful to know what some common cognitive biases are. That may make it a bit easier to guard against them. Here are just a few that are relevant to discussions of philosophy, apologetics, and argumentation.
The one bandied about the most these days is confirmation bias. One falls prey to confirmation bias by selecting evidence that confirms one's preconceived notions, and rejecting all other evidence. For example, have you ever heard someone complain that it is always they who are stopped the red light and everyone else makes it through the intersection in the nick of time? Obviously, over the course of one's driving career that is almost certainly not true. That person is just ignoring all the times they made it through the light (probably because one's mind isn't on the light when able to simply cruise through the intersection). In the case of a belief system, one may look for evidence for one's own beliefs while subconsciously rejecting any opposing evidence.
Here's a biggie: the belief bias. With belief bias, one is predisposed against an argument not on the basis of it's logic but on the basis of the believability of the conclusion. Think of the Pevensie siblings in The Lion, the Witch, and the Wardrobe - especially Peter and Susan. Lucy is incredibly excited to tell them that she has found another world in the wardrobe. This announcement is met with utter skepticism. However, the professor calls them on their skepticism: Lucy's excitement seems genuine, and she is the most honest of the siblings. So, logically, she is probably telling the truth. But what she is claiming is plainly ridiculous! And yet it was true.[2]
Another is the focusing effect. Ever seen some sports pundit chalk up the success or failure of a recently completed season on just one factor? Happens all the time. And they are wrong all the time. The success of a team over the course of a season - or even one game - is dependent on a myriad of factors. But these pundits are so certain it was all due to this one thing they identified.
One more. In general, we have a tendency to reject information or an argument from an adversary simply because it is coming from our adversary. It's sort of a psychological ad hominem- that argument is bad because it came from my adversary. Someone who falls for this is suffering from the scourge of reactive devaluation.
In closing, it might go without saying but I am no psychologist. And I'm not a philosopher (many biases have actually been identified first by philosophers). Yet I think it is important that we think carefully and honestly about important issues, so having at least some idea of how we may be biased may help guard against these tendencies. That and wisdom.
Notes:
1. This of course can be taken too far. There are some beliefs that are not based on rationality but nonetheless seem completely reasonable. If you see a tree, you believe a tree is there not by some deductive argument but because your perception of the tree's existence is basic. The belief the tree is there is what Plantinga would call a properly basic belief.
2. Granted, this is an example from a fictional work. A more pressing example might be the arguments for the resurrection. Many are rejected outright, simply on the grounds that the idea of a man rising from the dead is ridiculous.
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