Availability heuristic
Core pattern
Judgment uses mental availability as a shortcut for likelihood or frequency.
Ask: Is the example memorable, recent, emotional, or heavily covered?
Compare Biases
Availability Heuristic vs Frequency Illusion
Availability mistakes ease of recall for prevalence; frequency illusion makes newly noticed things seem suddenly common.
Frequency illusion
Core pattern
After noticing something, people start detecting it everywhere and infer that it has become more frequent.
Ask: Did attention change before the perceived frequency changed?
Why people mix them up
Both make something feel common because it is mentally easy to notice or retrieve.
Quick rule
Ask whether the item is easy to recall because it is vivid, or newly salient because attention has been tuned to it.
Diagnostic questions
Use these before deciding which label should carry the lesson.
Was the case already salient because it was vivid or emotionally loaded?
Did a new label, purchase, diagnosis, or conversation tune attention to the pattern?
What baseline count would distinguish real increase from noticing increase?
Mini cases
The same surface area can point to different underlying mechanisms.
Availability heuristic
After dramatic plane-crash coverage, flying feels more dangerous.
Why: Vivid recall is being used as a risk estimate.
Frequency illusion
After learning a new term, a student starts seeing it everywhere.
Why: Attention changed, making instances easier to notice.
Repair Move
Change the process, then choose the label.
Count occurrences against a baseline period before deciding whether prevalence changed.
Study the entries
Use the comparison as a bridge into the fuller pages.
Availability heuristic
The tendency to judge frequency, risk, or importance by how easily examples come to mind.
EstimationAssociationMedia & politicsPersonal decisions
Frequency illusion
The frequency illusion is that once something has been noticed then every instance of that thing is noticed, leading to the belief it has a high frequency of occurrence (a form of selection bias ). The Baader–Meinhof phenomenon is the illusion where something that has recently come to one's attention suddenly seems to appear with improbable frequency shortly afterwards. It was named after an incidence of frequency illusion in which the Baader–Meinhof Group was mentioned
RecallBaseline