The third module is the generation of analysis parameters from these events for further statistical analysis. The second module is an event detection of patterns in eye movement, such as fixations and saccades. The first module is preprocessing, such as blink detection and filtering. Eye movement data must undergo a principal processing pipeline including the following modules. Research into visual behavior is motivated by applied psychological questions the main topics of such research include the processing of facial expressions in social cognition (Brassen, Gamer, Rose, & Buchel, 2010 Domes et al., 2010 Gamer, Zurowski, & Buchel, 2010), the flexibility in the cognitive control of the oculomotor system analyzed in antisaccade paradigms (Liu et al., 2010 Stigchel, Imants, & Richard Ridderinkhof, 2011), and the experimental research of speech processing (Cho & Thompson, 2010 Myung et al., 2010). Other studies have investigated situations in which multiple objects must be tracked and have found that eye gaze is directed more toward the centroid of the target group than to any single target (Fehd & Seiffert, 2008 Huff, Papenmeier, Jahn, & Hesse, 2010) The relationship between attention and eye movements has also been discussed in some literature reviews (Rayner, 2009 Theeuwes, Belopolsky, & Olivers, 2009). A recent article (Golomb, Marino, Chun, & Mazer, 2011) discussed the representation of spatiovisual attention in retinotopically organized salience maps that were updated with saccadic movement. Some of these studies have shown that attention is always oriented in the same direction as saccades (Deubel & Schneider, 1996 Hoffman & Subramaniam, 1995 Irwin & Gordon, 1998 Kowler, Anderson, Dosher, & Blaser, 1995).Others have shown that attention and eye movements can be dissociated (Awh, Armstrong, & Moore, 2006 Hunt & Kingstone, 2003). Eye movements are closely linked to visual attention therefore, many studies have used the analysis of saccadic target regions to investigate the link between eye movements and covert attention. Fixations typically occur only with the reception of sensory information, and vision is generally suppressed during saccades (Matin, 1974). Eye movements are classified into two basic components: the movements of the eye itself (called saccades) and the times between movements when the eye remains in a single position (called fixations). In recent psychophysiological research, eye-tracking methodology has been widely used to obtain reaction parameters from eye movement data to analyze cognitive processes underlying visual behavior. GazeAlyze is distributed free of charge under the terms of the GNU public license and allows code modifications to be made so that the program's performance can be adjusted according to a user's scientific requirements. The preprocessing and event detection methods in GazeAlyze are based on the software ILAB 3.6.8 Gitelman (Behav Res Methods Instrum Comput 34(4), 605–612, 2002). GazeAlyze includes functions for correcting eye movement data for the displacement of the head relative to the camera after calibration in fixed head mounts. All functions can be controlled through graphical user interfaces. This includes detecting and filtering artifacts, detecting events, generating regions of interest, generating spread sheets for further statistical analysis, and providing methods for the visualization of results, such as path plots and fixation heat maps. GazeAlyze encompasses the main functions of the entire processing queue of eye movement data to static visual stimuli. GazeAlyze was developed for the batch processing of multiple data files and was designed as a framework with extendable modules. This article presents GazeAlyze, a software package, written as a MATLAB (MathWorks Inc., Natick, MA) toolbox developed for the analysis of eye movement data.
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