Figure 1 Example of stimulus presented during semantic eye tracking experiment. The position of the target word was counterbalanced across trials. “Fatigue” was the negative target word and “lartest” was the pseudoword. From: What Are You Looking At? Moving toward an Attentional Timeline in Insomnia: A Novel Semantic Eye Tracking Study Sleep. 2013;36(10):1491-1499. doi:10.5665/sleep.3042 Sleep | © 2013 Associated Professional Sleep Societies, LLC.
Figure 2 Illustration of the logistic power peak (LPP) parameters used to fit the probability difference distributions. The peak of each graph is the point in time where discrimination between target and distracter occurs and probability of fixation on target word increases thereafter. From: What Are You Looking At? Moving toward an Attentional Timeline in Insomnia: A Novel Semantic Eye Tracking Study Sleep. 2013;36(10):1491-1499. doi:10.5665/sleep.3042 Sleep | © 2013 Associated Professional Sleep Societies, LLC.
Figure 3 Probability of fixating on distracter word with parameters of interest highlighted; A = maximum error rate (probability), B = discrimination time (location of parameter A in time; ms) and C = home in on target time (ms). Parameters on left of dotted line are used to address the vigilance question and those on right are to address maintenance of gaze. From: What Are You Looking At? Moving toward an Attentional Timeline in Insomnia: A Novel Semantic Eye Tracking Study Sleep. 2013;36(10):1491-1499. doi:10.5665/sleep.3042 Sleep | © 2013 Associated Professional Sleep Societies, LLC.
Figure 5 (A) Mean first fixation duration (ms) and (B) home in to target time (ms). Negative, negative sleep words presented as target words; positive, positive sleep words presented as target words; neutral, neutral words presented as target words. From: What Are You Looking At? Moving toward an Attentional Timeline in Insomnia: A Novel Semantic Eye Tracking Study Sleep. 2013;36(10):1491-1499. doi:10.5665/sleep.3042 Sleep | © 2013 Associated Professional Sleep Societies, LLC.
Figure 4 Mean performance (SE bars) of PI and GS on three vigilance parameters. (A) Mean first fixation onset (ms). (B) Discrimination time (ms). (C) Maximum error rate. Negative, negative sleep words presented as target words; positive, positive sleep words presented as target words; neutral, neutral words presented as target words. From: What Are You Looking At? Moving toward an Attentional Timeline in Insomnia: A Novel Semantic Eye Tracking Study Sleep. 2013;36(10):1491-1499. doi:10.5665/sleep.3042 Sleep | © 2013 Associated Professional Sleep Societies, LLC.