Manipulation of attention affects subitizing performance: A systematic review and meta-analysis

Area of Science:

• Cognitive Psychology
• Neuroscience
• Visual Perception

Background:

• Subitizing, the immediate recognition of small quantities, is debated regarding its attentional requirements.
• Previous research on attention's role in subitizing yielded inconsistent findings due to methodological variations.

Purpose of the Study:

• To systematically investigate whether manipulating attentional demands affects subitizing performance.
• To provide a comprehensive meta-analysis of existing experimental data on attention and subitizing.

Main Methods:

• Conducted a systematic review and meta-analysis of fourteen studies involving 22 experiments and 35 comparisons.
• Analyzed data on response times, accuracy, and Weber acuity under varying attentional loads.

Main Results:

• Increased attentional demands significantly impaired subitizing, leading to slower response times (p < .010).
• Attentional manipulations reduced accuracy (p < .001) and worsened numerical acuity (p < .001).
• A potential publication bias was noted, but results remained significant.

Conclusions:

• Attention is integral to the process of subitizing small sets.
• Findings support a framework where attentional involvement increases from estimation to subitizing to counting.
• Emphasizing attentional mechanisms is vital for neurocognitive models of numerosity processing and understanding numerical deficits like dyscalculia.