Instructions for the Matrix Reasoning Test (MRT) of the Wechsler Adult Intelligence Scale-Third Edition were modified by explicitly stating that the subtest was untimed or that a per-item time limit would be imposed. The MRT was administered within one of four conditions: with (a) standard administration instructions, (b) explicit instructions that the test would not be timed, (c) an imposed 20-s time limit, or (d) an imposed 60-s time limit. Relative to standard instructions, an explicit statement that the MRT would not be timed did not alter the number of correct responses. Furthermore, correct responses in the 60-s time-limited group were not significantly different than with standard instructions. The 20-s time limit, however, led to significantly fewer correct responses. (Contains 1 table.)