Real World article
(written from a Production point of view)

According to the script for Star Trek IV: The Voyage Home, parallex matter echo was a phenomenon that could cause a starship's sensors to indicate that the pursuing ship was occupying the same space as the pursued ship. This false reading was generated by the warp drive regulators.

In 2286, on his memory test, Spock was asked by the computer to identify this condition.

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