Variable Details

Available Studies



Not Scaled

Variable Type 


Variable Name 




Odor identification - phase two
Odor identification - Sum of 20 items (MAP only)

Available in MAP

The odor identification/memory tests assess semantic odor memory (odor identification using 10 and 20 items) and episodic odor memory, in two phases. Both phases are measured using the OLFACT Test Battery and an olfactometer (Osmic Enterprises, Inc., Cincinnati, OH). See description of the OLFACT device measures subcategory for information on the test instrument.

In phase one of the test, participants are presented with 10 odors and asked to identify each one from 4 possible answer choices. There is a 10-minute retention interval between phases. In phase two participants are presented with the 10 odors from phase one as well as 10 new odors. For each of the 20 odors, participants are again asked to identify the odor from 4 answer choices and then asked whether the odor was presented in phase one (old) or introduced in phase two (new).

This variable is the 20-item odor identification measure in phase two. The variable ranges from 0 to 20 and is the number of odors correctly identified.