Features commonly seen with lower perceptual reasoning
Features associated with lower PRI can be divided broadly into demand from constructing shapes and layouts and demand from finding rules in figures.
- recognizing the same shape takes longer after its orientation changes
- constructing a completed form mentally from separate parts is difficult
- the correspondence between a model and the work in progress is lost while comparing them
- finding an unstated rule across several figures is difficult
- as candidate rules increase, it becomes unclear which have already been tested
The main demand is not seeing a figure, but retaining and transforming orientation, position, part–whole relationships, and candidate rules. Aligning orientation, naming relationships, keeping intermediate states, or moving physical objects can make the same task easier.
When PRI is lower, separate shape and layout from rule discovery
In WAIS-IV, PRI is calculated from Block Design, Matrix Reasoning, and Visual Puzzles. These do not all measure the same process.
- Shape and layout demand: Block Design and Visual Puzzles require shapes to be decomposed, reoriented, and assembled into a whole.
- Rule-discovery demand: Matrix Reasoning requires figures to be compared so that a relationship or rule can be found.
The first places greater weight on visuospatial processing (Gv); the second on fluid reasoning (Gf). When PRI is lower, do not stop at a single “nonverbal ability” label. Identify whether the larger demand appeared in manipulating shapes and layouts or discovering rules.
A WAIS-IV subtest pattern can suggest which demand to examine first; it does not produce separate Gv and Gf index scores. WAIS-5 makes VSI and FRI separate primary indexes; WAIS-IV and WAIS-5 compared explains the change.
BrainTypeIQ reports Gf and Gv separately, making this distinction directly visible in the results.
Demanding situations and ways to reduce the load
The common principle is to move relationships, intermediate states, and operation order from the mind into language, procedures, objects, and annotations.
| Type of demand | Situation at work or in learning | Reduce the demand by |
|---|---|---|
| Orientation and position | Relating a drawing to an object or one view to another | Rotate the paper or object and mark the reference direction with arrows |
| Parts and whole | Building from a completed drawing or imagining a cross-section | Arrange parts tentatively and keep the outline and intermediate states visible |
| Matching a model | Repeatedly comparing a model with work in progress | Put them side by side and label corresponding points with the same number |
| Implicit rules | Finding a common rule across figures or charts | Write candidate rules briefly, test them one at a time, and cross them out |
| Several operations | Continuing a multistage assembly or diagram-reading process | Use one operation per line and mark each completed step |
When using words, add only the needed relationship or operation—“left edge,” “90° clockwise,” “red face up,” or “A and B are equal”—rather than a long explanation. Try labels, numbered steps, physical manipulation, and sketches, then document and reuse the method that improves accuracy and repeatability.