Why Can We Justify a Choice We Did Not Make?

Imagine choosing the more attractive of two face photographs. The researcher hands your selection back and asks you to explain it, but uses sleight of hand to substitute the face you rejected. In a 2005 experiment, participants sometimes failed to report the mismatch and still gave reasons such as preferring the expression. The researchers called this choice blindness.

This does not simply show that people deliberately lie. We may not retain every comparison made during a choice. When an outcome is presented as “my choice”, the mind can use its visible features, broad preferences and the questioning context to construct a coherent explanation. That explanation may be sincere without being an accurate replay of the original decision process. Choice blindness also differs from choice-supportive memory: the latter involves later assigning more favourable features to the chosen option, whereas the outcome here has been switched during the task.

The boundaries matter. Exchanges between more distinctive objects are detected more often, and task design, warnings and social cues can affect reporting. A 2025 pupillometry study also found sensitivity to manipulated trials in pupil responses even when participants did not report the mismatch. Failing to say that something changed may therefore differ from registering nothing at all, and the authors stressed the influence of experimental design.

My judgement is that choice blindness does not establish that people never know why they choose. It shows more precisely that introspection is not a complete record being read back; it is a reconstruction constrained by memory and present evidence. For an important decision, recording criteria and trade-offs at the time gives a better basis for review than relying only on a fluent explanation afterwards.

Sources: https://pubmed.ncbi.nlm.nih.gov/16210542/
https://pmc.ncbi.nlm.nih.gov/articles/PMC12713319/