Picture Completion asks the person to find an important missing part
Picture Completion presents a familiar object or everyday scene and asks the person to identify an important missing part within the time limit.
In WAIS-IV, Picture Completion is a supplemental subtest for the Perceptual Reasoning Index (PRI). PRI is normally calculated from Block Design, Matrix Reasoning, and Visual Puzzles, so a report may show a Picture Completion scaled score even when it was not used to calculate PRI or FSIQ.
Picture Completion is not included in WAIS-5. Understanding it remains useful for people reading WAIS-IV results. WAIS-IV and WAIS-5 compared explains the wider change in subtest structure.
Noticing something unusual is not enough. The person must judge whether the omission is an important part of the object's structure or the situation's meaning.
It therefore differs from a simple spot-the-difference activity. The person must connect a visual detail with what the picture means and how the object or situation normally works. Finding the omission involves:
- recognising the object or situation represented by the whole picture;
- searching its parts for something that appears incomplete or unusual;
- comparing the picture with acquired knowledge about the object's structure or purpose;
- judging which possible omission is important; and
- identifying the location or missing content within the time limit.
What higher and lower Picture Completion scores can show
A higher scaled score indicates that the person could recognise the scene, search it, and connect a visual inconsistency with knowledge of how the object or situation works. A lower score can reflect greater difficulty with deciding which detail matters even when the details are visible, connecting the picture with knowledge of the object's normal structure or purpose, or reaching an answer without spending too much time checking the whole scene.
The same processing is used when identifying an essential missing element in an otherwise nearly complete document or procedure.
If Picture Completion is higher than Block Design or Visual Puzzles, meaningful scenes may be easier than abstract shape construction. If it is higher than Matrix Reasoning or Figure Weights, using acquired knowledge may be easier than deriving a new visual or quantitative rule. How to read WAIS results places these differences in the full profile.
How Picture Completion differs from Block Design, Visual Puzzles, Matrix Reasoning, and Figure Weights
| Subtest | Direct task | Main processing involved |
|---|---|---|
| Picture Completion | Find an important missing part in a meaningful picture | Visual search, comparison with acquired knowledge, and judgment of importance |
| Block Design | Reproduce a model using blocks | Shape analysis and physical reconstruction |
| Visual Puzzles | Choose the three pieces that form a completed shape | Shape decomposition, mental rotation, and shape integration |
| Matrix Reasoning | Choose the missing part of a matrix or sequence | Discovering and integrating rules among figures |
| Figure Weights | Choose the figure that balances a scale | Deriving an unknown quantity from equivalence |
BrainTypeIQ has no direct Picture Completion equivalent
BrainTypeIQ's visual tasks use abstract figures rather than familiar scenes with a meaningful omission. Visual Puzzles examines part-whole construction within visuospatial processing, or Gv, Matrix Reasoning examines visual rule discovery, and Symbol Search examines rapid matching. None directly measures the combination of scene knowledge and importance judgment used by Picture Completion.