Reading focus
Syllabus: What Is Intelligence?
Track the proposed overlap of executive and domain-specific processes, including bottlenecks. Compare shared demands during tasks with mutual support during development.
Why you’re reading it. Make a process explanation precise enough to generate predictions beyond correlations among total scores.
A question to consider. Two programme tasks share the need to keep a rule active while ignoring distractions. What change to their demands could help investigate whether that overlap contributes to their correlation?
Why this reading
The tasks in an intelligence battery differ, yet may draw on some of the same processes. Process overlap theory explains how this overlap could generate a general factor without requiring a single general mental capacity. It connects the structure of test scores with an account of what people do while solving problems.
Before you read
Domain-specific processes support particular kinds of information or task. Executive processes help coordinate goal-directed activity across tasks. A bottleneck limits performance when a necessary process cannot meet a task's demands. The paper contrasts a reflective interpretation, in which an underlying attribute causes its indicators, with a formative interpretation, in which a summary is constituted by its components.
Read for
- Identify what processes are assumed to overlap, what executive bottlenecks contribute, and how the account differs from simply renaming g.
- Separate evidence about variation between people from evidence about processes operating within a person.
- Ask which predictions about tasks, selective demands, or brain processes could discriminate this theory from competing accounts of the same factor structure.
Consider afterwards
- Two tasks correlate, and adding an executive-control demand increases the association between them. How could process overlap explain this pattern, and what alternative explanations or measurement problems would still need investigation?
Editorial context
This is a substantial theoretical target article, not a consensus statement or a decisive experiment. A stable general factor does not by itself establish or refute its causal account. The network approach emphasizes developmental interactions, whereas process overlap emphasizes shared demands across tasks; aspects of the proposals can be combined. Their usefulness depends on explicit mechanisms and predictions beyond reproducing familiar correlations.