Panel conditioning is a form of response bias that develops when participants are recruited from the same panel pools repeatedly, causing them to anticipate question formats, adopt socially desirable answers, or moderate their expressed opinions to align with perceived researcher expectations. In qualitative research operations, panel conditioning is a persistent validity threat because professional respondents, those who participate in multiple studies per month, often produce polished, rehearsed answers that lack the spontaneity and candor that make qualitative data useful. The effect compounds over time: the more frequently a participant engages with research, the more their responses reflect learned behavior rather than authentic experience. Controlling for panel conditioning requires careful recruitment screening, participant rotation, and study designs that reward genuine, unguarded disclosure.