Cancellation asks the person to find and mark targets in a broad array
The WAIS Cancellation subtest defines targets by a combination of color and shape. The person searches for those targets in a broad array containing many figures and marks each one they find. They must continue identifying figures that meet both conditions while avoiding distractors that resemble a target in only one respect.
In WAIS-IV, Cancellation is a supplemental subtest of the Processing Speed Index, or PSI. PSI is normally calculated from Symbol Search and Coding, so Cancellation may appear on a report without contributing to PSI. Cancellation is not included in WAIS-5; Naming Speed Quantity provides distinct processing-speed information through spoken quantity naming with reduced written output. WAIS-IV and WAIS-5 compared explains the wider edition change.
Unlike Symbol Search, which presents a small search set one item at a time, Cancellation keeps the same target rule across a wide area. The person must retain both target features, scan systematically, track where they have already searched, reject similar distractors, and mark targets quickly.
What higher and lower Cancellation scores can show
In WAIS-IV, a higher scaled score indicates strength in retaining the target conditions and finding the relevant figures quickly and accurately across a broad array while avoiding similar distractors.
A lower score can reflect missed targets, incorrect markings, an inefficient search path, or slower marking. These error types matter because they distinguish difficulty sustaining the search rule from difficulty covering the array within the time limit. Characteristics of lower processing speed explains related everyday demands.
If Cancellation is clearly lower than Symbol Search, continuously searching a broad array while retaining the same target rule may be more demanding than matching symbols within a small search set. If it is lower than Coding, selective attention and wide-area visual search may have affected performance more than referring to a key and writing symbols. How to read WAIS results explains how to interpret these differences within the full profile.
How Cancellation differs from Symbol Search, Coding, and Naming Speed Quantity
| Subtest | Direct task | Processing emphasized |
|---|---|---|
| Cancellation | Find and mark targets in a broad array of figures | Wide-area search, selective attention, and accurate rejection of distractors |
| Symbol Search | Decide whether either target appears in a small set of symbols | Focused visual search, shape matching, and present-or-absent decisions |
| Coding | Write the symbol paired with each number | Searching and matching a key, written symbol production, and associative learning |
| Naming Speed Quantity | Recognize quantities and say the corresponding numbers aloud | Spoken quantity naming with reduced written output |
Comparing the scores can show whether performance is relatively stronger in focused matching, continuous wide-area search, written work using a reference key, or spoken quantity naming.
BrainTypeIQ Symbol Search uses focused matching rather than wide-area cancellation
BrainTypeIQ Symbol Search compares two target symbols with five search symbols in each item, and the person records a present-or-absent decision on screen. Its structure is therefore closer to WAIS Symbol Search than to Cancellation.
BrainTypeIQ does not use a broad paper array or handwritten marking. It measures processing speed, or Gs, through rapid visual search, matching, and present-or-absent decisions in compact search sets.