Fig. 5From: Evaluating the effectiveness of different perceptual training methods in a difficult visual discrimination task with ultrasound imagesExample of a comparison training trial in Experiment 1b. Note The left panel contains half of a collage of a liver that is a grade 5 (Moderate) and the right panel contains half of a collage of a liver that is a grade 3 (Mild). In this example, participants were asked which panel of images were 3 (Mild) and made their response by pressing the F (left panel) or J (right panel) key. This is an example of the second most difficult comparison (level 5), where livers that are two grades apart are comparedBack to article page