Resolution:
## Figure 8.
Examples of stimuli used in Experiment 2. The first two rows show the 22 stimuli presented to one observer during the first
block of the experiment. The observer discriminated between the same two textures
during the whole experiment. The noise level varied from 100% (left side; 0% phase
coherence) to 0% (right side; 100% phase coherence). Histograms in the third row show
the distribution of pixel contrasts averaged across all stimuli seen by this observer
at each level of phase coherence. Note that, unlike the stimuli used in Experiment
1, the pixel histograms had a relatively constant Gaussian distribution across all
levels of phase coherence. This constant histogram distribution is depicted in the
last row, showing the mean skewness (left), and mean kurtosis (middle), as a function
of phase coherence. The error bars correspond to 95% confidence interval computed
using a bootstrap percentile technique (1000 resamples). In the bottom right end graph,
kurtosis for each image (each circle) is expressed as a function of skewness. There
was no relationship between the two statistical descriptors.
Rousselet |