Proponents of speed-reading courses or facilitated communication hold stubbornly to their beliefs despite contradictory evidence. Which warning sign of pseudoscience does this illustrate?

Question

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The fact that proponents of speed-reading courses or facilitated communication refuse to change their beliefs despite contradictory evidence indicates a lack of self-correction, which is a warning sign of pseudoscience.

Proponents of Speed-Reading Courses or Facilitated Communication Hold Stubbornly to Their