Fig. 3.

Example dataset for the Ebbinghaus task. Maximum likelihood fits to the data for an 11-year-old typically developing child in the Ebbinghaus task, including two pedestal values (−5, +5%) and two context conditions (S-L: where the reference stimulus has small context circles and the comparison stimuli have large context circles, and L-S: where the reference has large context circles and the comparison stimuli have small context circles). The red and green lines represent fits to the data where internal noise (σ) is constant across context conditions, but bias (μ) is free to vary. The black line represents the fit of a single model where bias and internal noise are both held constant across the context conditions