Numerical cognition — Magnitude-representation account of math anxiety

Seeing a small number would speed detection of left-side targets and a large number right-side targets, as Fischer et al. (2003, Experiment 2) reported.

In a registered replication with 1,105 participants at 17 labs and four interstimulus intervals, the effect was in the original direction only half the time (proportion .50); effects within and across labs were minuscule and incompatible with the original. Finger counting, reading direction, handedness and maths fluency or anxiety did not moderate it.

Why it matched: same research area · failed the same way: Held in the model species, not beyond it

Children with developmental language disorder would show weaker hand preference and less left-lateralised language, as earlier studies reported.

In 107 twin children with DLD and 156 typically developing twins aged 6–11, there were no group differences in handedness, functional transcranial Doppler language laterality, or consistency of left-hemisphere dominance. Right-lateralised language was in fact more common in the typically developing group (19.9% vs 9.3%), and links between laterality and language scores also did not replicate.

Why it matched: similar wording · failed the same way: Held in the model species, not beyond it