I have a degree in personnel psychology and spent 25 years watching smart, well-intentioned people make terrible decisions in high-pressure situations. Not because they were irrational. Because they were human.
The same thing happens in mediation. People come in with a legitimate dispute and legitimate interests, and somewhere in the process things break down. Not because the facts don't support a resolution, but because of what's happening beneath the surface of the conversation.
Understanding cognitive bias is not an academic exercise. It's practical. When you know what's happening in a room, you can do something about it.
Anchoring bias
The first number in a negotiation has an outsized influence on everything that follows. This is called anchoring, and it affects everyone, including people who know about it.
If someone opens a negotiation with an extreme demand, the natural human response is to negotiate around that number rather than rejecting it as the starting point. A plaintiff who opens at $500,000 has just anchored the conversation at $500,000, even if the actual value of the case is closer to $75,000.
As a mediator, part of my job is to help parties reset the anchor. That might mean redirecting the conversation to objective criteria, asking both sides to justify their numbers from first principles, or surfacing information that puts the anchor in a different context. It's not about telling people they're wrong. It's about expanding the frame.
Attribution error
When something goes wrong, we tend to attribute it to the character of the other person rather than to circumstances. If your contractor missed a deadline, your instinct is that he's unreliable, not that he had a materials supplier fail him. If your business partner made a decision you disagree with, your instinct is that she doesn't respect you, not that she had information you weren't aware of.
This matters enormously in mediation because attribution error turns what might be a solvable practical problem into a personal conflict. Once people are fighting about character rather than facts, resolution gets much harder.
One of the most valuable things I do in a session is help people separate the behavior from the interpretation. What actually happened? What do we know for certain? What are we assuming? That distinction alone can shift the entire tone of a conversation.
Confirmation bias
We pay attention to information that confirms what we already believe and discount information that challenges it. In a dispute, this means each party has usually spent weeks or months building a case in their own mind that is internally consistent and feels completely airtight. The problem is that the other side has been doing the same thing, starting from completely different assumptions.
Confirmation bias is why parties in mediation are often genuinely shocked by each other's perspectives. Not because one side is lying, but because each side has been selectively processing the same events through very different filters.
Surfacing that dynamic directly is one of the most useful things a mediator can do. Not to assign blame, but to help each party understand that the other side's position didn't come from nowhere.
Recency bias
Whatever happened most recently in a dispute feels most important. If the last interaction between two parties was a hostile email, that email will dominate the mediation even if the business relationship was positive for years before it.
Recency bias makes people reactive rather than strategic. They're responding to the last thing that happened rather than thinking about what outcome actually serves their long-term interests.
Part of my role is to help parties zoom out. What is the full history here? What was working before things broke down? What outcome would actually serve your interests six months from now? That longer view often creates space for solutions that the immediate emotional reaction closes off.
I offer presentations on cognitive bias in negotiation for bar associations and firm groups. If you're interested in bringing this content to your team, reach out through the contact page.