Adaptation-Exaptation Test
Distinguish evolved functions from traits that piggyback on them
- Difficulty
- Advanced
- Time to result
- ~weeks to results
- Steps
- 5
- Confidence
- 97%
Saad distinguishes adaptations from exaptations. An adaptation is a trait proposed to have been shaped because it supported survival or reproduction. An exaptation, in his usage, is a later phenomenon that piggybacks on a mechanism already present for another reason. He uses pornography as an example: humans did not evolve specifically to consume online pornography, he argues, but the product can exploit visual attention and preferences for sexual variety. The test asks whether the present function plausibly drove the trait's evolution or whether an older mechanism is being recruited in a newer setting. This distinction improves causal language, but it does not prove either account. Competing explanations need evidence, and describing a hijacked mechanism does not establish addiction in any particular person.
Origin
Extracted from The Diary of a CEO
Core principles
- 01An adaptation is proposed to confer survival or reproductive benefits
- 02An exaptation uses an existing mechanism for a different role
- 03Modern products can exploit preferences that evolved in another environment
- 04A plausible fit still requires evidence rather than storytelling
How to run it
- 1
Define the phenomenon
State the trait, behavior, product response, or cultural practice that needs classification.
- 2
Name the present function
Describe what the phenomenon currently does or appears to accomplish.
Watch out Current usefulness does not prove evolutionary origin.
- 3
Test direct adaptation
Ask whether evidence suggests the trait was shaped because that function improved survival or reproduction.
Pro tip Look for comparative, historical, physiological, or experimental evidence.
- 4
Test piggybacking
Identify an older mechanism that the present phenomenon could recruit without having evolved specifically for it.
- 5
Compare predictions
State what each account predicts and what observation could distinguish them.
Watch out Avoid declaring a winner when both accounts remain speculative.
In the wild
Saad argues that online pornography was absent from ancestral environments and therefore was not itself a target of evolution. He proposes that it recruits existing male preferences for visual sexual stimuli and variety, potentially creating a behavioral trap in some users.
→ The product is framed as exploiting older mechanisms rather than as a purpose-built adaptation.
Common mistakes
Calling every trait adaptive
A trait's existence or present use does not establish that natural or sexual selection shaped it for that use.
Diagnosing from the model
A proposed hijacking mechanism does not establish that a specific person's use is compulsive or disordered.
Is it for you?
Best for
Evaluating claims about whether a behavior, product response, or cultural practice directly evolved for its present role.
Not ideal for
Proving evolutionary history from analogy alone or excusing harmful behavior as biologically inevitable.
From the transcript
“There is a distinction between an adaptation and an exaptation.”
“Pornography utilizes existing systems to trap us.”
From the episode
The Cancelled Professor: Husbands Are More Dangerous Than You Think! Men Are Hardwired To Cheat! Science Proves Monogamy Isn't Real! - Gad Saad