The RGDT-Standard and Expanded version is an auditory processing disorder test for ages 5 and up using non-verbal stimuli. It is considered a temporal test using temporal resolution and is sensitive to cortical particularly left temporal lobe lesions.
The RGDT-Standard and Expanded includes the standard RGDT in its entirety along with an expanded portion at the end. The expanded portion of the test is included for individuals whose gap detection threshold exceeds 40 msec. This test begins at time intervals longer than those measured by the standard portion of the RGDT, and includes time intervals of 10 msec. between 40 and 100 msec, and 50 msec. intervals between 100 and 300 msec. The expanded portion of the test is administered in the same manner as the standard portion.
Individuals who require the expanded portion of the test have already demonstrated abnormal temporal processing abilities. The single purpose is to determine the time interval in which their gap detection thresholds exist. This information can be used to measure improvement in temporal processing abilities following remediation. By definition, patients with temporal processing disorders will have a wide range of gap detection thresholds. Therefore, there are no normative data associated with the expanded portion of the RGDT.
The Random Gap Detection Test-Standard and Expanded includes a) audio recording, and b) manual and score forms as printable pdf files. The 31-page manual pertains to the standard portion of the test. It is comprised of sections on development, background, administration, and interpretation. It includes normative data for ages 5 and up. An additional sheet with sections on administration and interpretation is included for the expanded portion of the test. Available from Auditec, Inc. Call 1-800-669-9065 (from US) or 314-416-1050 (outside the US) to order. FREE shipping to the contiguous US.