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So-called hidden consecutives, also called direct or covered octaves or fifths, occur when two independent parts approach a single perfect fifth or octave by similar motion instead of oblique or contrary motion. A single fifth or octave approached this way is sometimes called an exposed fifth or exposed octave.
Are direct octaves allowed?
A venerable rule of traditional Western part writing is the so-called Direct Octaves Rule (also known as Hidden or Exposed octaves), whereby similar pitch motion (i.e., two or more voices moving in the same direction) to a perfect octave should be avoided unless step motion is used.
Are unequal fifths allowed?
The reverse, a rising P5→d5, is acceptable voice leading (no deduction). Unequal fifths in either order, when descending, are acceptable (no deduction).
What are hidden fifths and octaves?
Anyway, it sounds like you're studying part-writing. Hidden fifths (hidden octaves are the same idea, but with octaves) is when two voices move in similar motion into a fifth in the next chord. This isn't the same as parallel fifths, where they move together from one fifth to another.
