Figure 6:

Effects of LSB masker on natural LTB segmentation thresholds.

(a) Segmentation thresholds are given in units of absolute luminance differences ΔL across the diagonal for an LTB target (blue symbols) and LSB target (black symbols) masked by an LSB. Blue dotted lines indicate segmentation JND for the LTB target in the absence of a masker (Experiment 1). Black dotted lines indicate the predictions of the linear transducer model for the LTB target in the presence of the LSB masker. Black dash-dot lines indicate predictions of the linear transducer model for the LSB target in the presence of the LSB masker. Symbols indicate medians, and lines represent 95% bootstrapped confidence intervals.

(b) Same as (a) but in JND units.