Ad Hominem is attacking the person rather than the argument. It sits in the Cognition dimension (COG) of the Human Behavior Taxonomy™ as element HBT-COG-0010, within the Relevance Fallacy family. The core principle: attacking the person rather than the argument. In incentive terms, it matters because it changes the payoff people perceive before they choose — which means it can be designed for, or exploited.
Scientific Definition
Attacking the person rather than the argument.
Plain-English Definition
Attacking the person rather than the argument.
Feynman Explanation
Shoot the messenger; ignore the message; report success.
Core Principle
Attacking the person rather than the argument.
Mechanisms
Attacking the person rather than the argument.
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Inputs (Triggers)
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Outputs (Behaviors)
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Behavioral Signature
Shoot the messenger; ignore the message; report success.
Examples
- Dismissing analysis because the analyst once worked for a competitor.
- Decision quality declines when credentials become the proxy for content.
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Original analysis from The Incentives Lab — how this element behaves inside real payoff structures.
Why this element matters to incentive design
This is one of the elements leaders describe as a values gap. It is a payoff gap. The mechanism underneath it is straightforward: attacking the person rather than the argument. You can recognize it in the field by its signature: shoot the messenger; ignore the message; report success. Every element in the Cognition dimension changes the perceived payoff of an action before the action happens, which is exactly where incentive design has leverage.
How it gets exploited
Left undesigned, decision quality declines when credentials become the proxy for content. It is amplified whenever decision quality declines when credentials become the proxy for content. Inside organizations that shows up as decision quality declines when credentials become the proxy for content. The pattern is the same one Goodhart's Law describes: the measurable proxy attracts the effort, and the purpose behind it quietly loses funding.
How the Lab designs around it
The redesign move is to make the desired behavior observable, remove whatever currently pays for its opposite, and attach the reward to the behavior rather than to the noisy outcome downstream of it. Treat it as infrastructure. Once you can see it in your own system, most of the argument about culture resolves itself.
Famous Experiments
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Design Principles
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Measurement Approaches
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Evidence
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The Perverse Incentive Lens™
How this behavior is exploited — and how to redesign around it.
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Interactive Mini Network
Click any neighbor to re-center the graph and follow the threads of connection.
Knowledge Graph Neighbors
Auto-linked to the rest of the Human Behavior Taxonomy by family, domain, dimension, and shared keywords.
It's true because authority says so.
Common sense says so, therefore it's true.
Believing something is true because of the consequences of its truth.
Claiming something is true because it hasn't been proven false (or vice versa).
If it's 'natural,' it's good.
It's better because it's newer.
It's right because it's how we've always done it.
I can't believe it; therefore it isn't true.
Saying it enough times until it sounds true.
It's true because many believe it.
Asking the other side to disprove an unsupported claim.
Concluding that because an argument contained a fallacy, its conclusion must be false.
Where Ad Hominem is cited in the corpus
Essays, field guides, and diagnostics from The Incentives Lab that apply this element.
- EssayGoodhart's Law in the Real World
How measurable proxies capture judgment.
- EssayThe Perverse Incentives Hiding in Your KPIs
Cognitive shortcuts turned into scorecards.
- CourseIncentives 101
The free ten-part primer on reading a payoff structure.
- ReferenceThe Periodic Table of Human Behavior
The full 1,267-element map this page belongs to.
Questions about Ad Hominem
- What is Ad Hominem?
- Ad Hominem is attacking the person rather than the argument. It sits in the Cognition dimension (COG) of the Human Behavior Taxonomy™ as element HBT-COG-0010, within the Relevance Fallacy family. The core principle: attacking the person rather than the argument. In incentive terms, it matters because it changes the payoff people perceive before they choose — which means it can be designed for, or exploited.
- What is an example of Ad Hominem?
- Decision quality declines when credentials become the proxy for content. The Incentives Lab catalogs everyday, organizational, and historical instances of this element on its Human Behavior Taxonomy™ page (HBT-COG-0010).
- How is Ad Hominem exploited?
- Decision quality declines when credentials become the proxy for content.
- How do you design around Ad Hominem?
- Name the behavior you want in observable terms, remove what currently pays for the opposite, attach the reward to the behavior rather than a lagging proxy, and publish how you will detect gaming.
- Which behavioral dimension does Ad Hominem belong to?
- Ad Hominem is classified in the Cognition dimension (COG) of the Human Behavior Taxonomy™, family "Relevance Fallacy", class "Logical Fallacy". Its permanent identifier is HBT-COG-0010 and its evidence grade is B.