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Following up on an exchange about the relation between microsaccades and spatial attention (Horowitz, Fencsik, Fine, Yurgenson, & Wolfe, 2007; Horowitz, Fine, Fencsik, Yurgenson, & Wolfe, 2007; Laubrock, Engbert, Rolfs, & Kliegl, 2007), we examine the effects of selection criteria and response modality. We show that for Posner cuing with saccadic responses, microsaccades go with attention in at least 75% of cases (almost 90% if probability matching is assumed) when they are first (or only) microsaccades in the cue target interval and when they occur between 200 and 400 msec after the cue. The relation between spatial attention and the direction of microsaccades drops to chance level for unselected microsaccades collected during manual-response conditions. Analyses of data from four cross-modal cuing experiments demonstrate an above-chance, intermediate link for visual cues, but no systematic relation for auditory cues. Thus, the link between spatial attention and direction of microsaccades depends on the experimental condition and time of occurrence, but it can be very strong.
Eye movements during the reading of multi-line pages of texts were analyzed to determine the trajectory of reading saccades. The results of two experiments showed that the trajectory of the majority of forward-directed saccades was negatively biased, i.e., the trajectory fell below the start and end location of the saccadic movement. This is attributed to a global top-to-bottom orienting of attention. The curvature size and the proportion of negative trajectories were diminished when linguistic processing demands were high and when the beginning lines of a page were read. Longer pre-saccadic fixations also yielded smaller saccadic curvatures, and they resulted in fewer negatively curved forward-directed saccades in Experiment 1 although not in Experiment 2. These findings indicate that the top-to- bottom pull of saccadic trajectories is modulated by processing demands and processing opportunities. The results are in general agreement with a time-locked attraction-inhibition hypothesis, according to which the horizontal movement component of a saccade is initially subject to an automatic top-to-bottom orienting of attention that is subsequently inhibited.
e movements during the reading of multi-line pages of texts were analyzed to determine the trajectory of reading saccades. The results of two experiments showed that the trajectory of the majority of forward-directed saccades was negatively biased, i.e., the trajectory fell below the start and end location of the saccadic movement. This is attributed to a global top-to-bottom orienting of attention. The curvature size and the proportion of negative trajectories were diminished when linguistic processing demands were high and when the beginning lines of a page were read. Longer pre-saccadic fixations also yielded smaller saccadic curvatures, and they resulted in fewer negatively curved forward-directed saccades in Experiment 1 although not in Experiment 2. These findings indicate that the top-to- bottom pull of saccadic trajectories is modulated by processing demands and processing opportunities. The results are in general agreement with a time-locked attraction-inhibition hypothesis, according to which the horizontal movement component of a saccade is initially subject to an automatic top-to-bottom orienting of attention that is subsequently inhibited.
Eye movements in reading are sensitive to foveal and parafoveal word features. Whereas the influence of orthographic or phonological parafoveal information on gaze control is undisputed, there has been no reliable evidence for early parafoveal extraction of semantic information in alphabetic script. Using a novel combination of the gaze- contingent fast-priming and boundary paradigms, we demonstrate semantic preview benefit when a semantically related parafoveal word was available during the initial 125 ms of a fixation on the pretarget word (Experiments 1 and 2). When the target location was made more salient, significant parafoveal semantic priming occurred only at 80 ms (Experiment 3). Finally, with short primes only (20, 40, 60 ms), effects were not significant but were numerically in the expected direction for 40 and 60 ms (Experiment 4). In all experiments, fixation durations on the target word increased with prime durations under all conditions. The evidence for extraction of semantic information from the parafoveal word favors an explanation in terms of parallel word processing in reading.
In dieser Studie wurde untersucht, wie das Leseverständnis von Schülern der 5. Klasse mittels reziproken Lehrens gefördert werden kann. Dabei wurde insbesondere betrachtet, welche Relevanz die Vermittlung spezifischer Lesestrategien besitzt. Die Stichprobe bestand aus 380 Schülern aus 15 Klassen, die einer von drei Bedingungen zugewiesen wurden: (a) Training der vier Lesestrategien Klären, Fragen, Vorhersagen, Zusammenfassen (4S), (b) Training der drei Lesestrategien Klären, Fragen, Vorhersagen (3S) oder (c) Training der Leseflüssigkeit (LF; keine Vermittlung von Lesestrategien). Der Lernerfolg wurde unmittelbar sowie 9 Wochen nach Abschluss der Intervention mittels standardisierter Leseverständnis- und Leseflüssigkeitstests sowie selbst konstruierter Tests zur Erfassung der Qualität der Strategieanwendung erhoben. Zusätzlich wurden im Verlauf des Trainings Prozessdaten erfasst. Bezogen auf die Leseflüssigkeit zeigte der Prätest-Posttest-Vergleich, dass sich Schüler aller Bedingungen verbesserten. Zum Follow-up-Test schnitten hingegen LF-Schüler besser ab als Schüler der Strategie-Bedingungen. Bezogen auf das Leseverständnis erreichten nach Abschluss des Trainings 3S-Schüler bessere Leistungen als Schüler der anderen Trainingsbedingungen. Sie konnten ihren Vorsprung mittelfristig jedoch nicht aufrechterhalten. 3S- und 4S-Schüler erstellten zum Posttest signifikant bessere Zusammenfassungen als LF-Schüler. Schließlich zeigten die Prozessdaten, dass sich Schüler beider Strategiebedingungen kontinuierlich in der Anwendung der Lesestrategien Fragen und Vorhersagen verbesserten. Es werden Veränderungen des Trainings zur Steigerung der Effektivität bei Umsetzung in Regelschulklassen diskutiert.
During reading, saccadic landing positions within words show a pronounced peak close to the word center, with an additional systematic error that is modulated by the distance from the launch site and the length of the target word. Here we show that the systematic variation of fixation positions within words, the saccadic range error, can be derived from Bayesian decision theory. We present the first mathematical model for the saccadic range error; this model makes explicit assumptions regarding underlying visual and oculomotor processes. Analyzing a corpus of eye movement recordings, we obtained results that are consistent with the view that readers use Bayesian estimation for saccade planning. Furthermore, we show that alternative models fail to reproduce the experimental data.