TY  - JOUR
A1  - Thiel, Marco
A1  - Romano, Maria Carmen
A1  - Kurths, Jürgen
A1  - Rolfs, Martin
A1  - Kliegl, Reinhold
T1  - Generating surrogates from recurrences
N2  - In this paper, we present an approach to recover the dynamics from recurrences of a system and then generate (multivariate) twin surrogate (TS) trajectories. In contrast to other approaches, such as the linear-like surrogates, this technique produces surrogates which correspond to an independent copy of the underlying system, i.e. they induce a trajectory of the underlying system visiting the attractor in a different way. We show that these surrogates are well suited to test for complex synchronization, which makes it possible to systematically assess the reliability of synchronization analyses. We then apply the TS to study binocular fixational movements and find strong indications that the fixational movements of the left and right eye are phase synchronized. This result indicates that there might be only one centre in the brain that produces the fixational movements in both eyes or a close link between the two centres.
Y1  - 2008
UR  - http://rsta.royalsocietypublishing.org/
SN  - 1364-503X
ER  - 
TY  - JOUR
A1  - Rolfs, Martin
A1  - Laubrock, Jochen
A1  - Kliegl, Reinhold
T1  - Microsaccade-induced prolongation of saccadic latencies depends on microsaccade amplitude
Y1  - 2008
UR  - http://www.jemr.org/
SN  - 1995-8692
ER  - 
TY  - JOUR
A1  - Rolfs, Martin
A1  - Kliegl, Reinhold
A1  - Engbert, Ralf
T1  - Toward a model of microsaccade generation : the case of microsaccadic inhibition
Y1  - 2008
UR  - http://www.journalofvision.org/content/by/year
U6  - https://doi.org/10.1167/8.11.5
SN  - 1534-7362
ER  - 
TY  - JOUR
A1  - Risse, Sarah
A1  - Engbert, Ralf
A1  - Kliegl, Reinhold
T1  - Eye-movement control in reading : experimental and corpus-analysis challenges for a computational model
Y1  - 2008
SN  - 978-7-201-06107-8
ER  - 
TY  - JOUR
A1  - Philipp, Doris
A1  - Kliegl, Reinhold
T1  - Fähigkeiten
N2  - Unter der Rubrik Didaktisches Stichwort beschaeftigen sich die Autoren mit der Persoenlichkeitsentwicklung im Umfeld der Arbeits- und Berufsfindung bei Jugendlichen und behandeln in diesem Zusammenhang vornehmlich die Begriffe Faehigkeit, Fertigkeit und die verschiedenen Facetten der Intelligenz. Sie stellen u. a. das Berliner Intelligenzstrukturmodell, eine Theorie multipler Intelligenzen sowie erweiterte Forschungsansaetze vor.
Y1  - 2008
SN  - 1438-8987
ER  - 
TY  - JOUR
A1  - Philipp, Doris
A1  - Kliegl, Reinhold
T1  - Fertigkeiten
N2  - Im vorliegenden Didaktischen Stichwort wird der Begriff der Fertigkeit erlaeutert. Dazu unterscheiden die Autoren zunaechst verschiedene Arten von Fertigkeiten, stellen die Phasen des Fertigkeitserwerbs vor und zeigen diese exemplarisch am Erlernen des korrekten Gebrauchs eines Messschiebers im Rahmen von Mess- und Prueftechniken bei der Metallverarbeitung.
Y1  - 2008
SN  - 1438-8987
ER  - 
TY  - JOUR
A1  - Ong, James Kwan Yau
A1  - Kliegl, Reinhold
T1  - Conditional co-occurrence probability acts like frequency in predicting fixation durations
Y1  - 2008
UR  - http://www.jemr.org/
SN  - 1995-8692
ER  - 
TY  - JOUR
A1  - Moshel, Shay
A1  - Zivotofsky, Ari Z.
A1  - Liang, Jin-Rong
A1  - Engbert, Ralf
A1  - Kurths, Jürgen
A1  - Kliegl, Reinhold
A1  - Havlin, Shlomo
T1  - Persistence and phase synchronization properties of fixational eye movement
N2  - When we fixate our gaze on a stable object, our eyes move continuously with extremely small involuntary and autonomic movements, that even we are unaware of during their occurrence. One of the roles of these fixational eye movements is to prevent the adaptation of the visual system to continuous illumination and inhibit fading of the image. These random, small movements are restricted at long time scales so as to keep the target at the centre of the field of view. In addition, the synchronisation properties between both eyes are related to binocular coordination in order to provide stereopsis. We investigated the roles of different time scale behaviours, especially how they are expressed in the different spatial directions (vertical versus horizontal). We also tested the synchronisation between both eyes. Results show different scaling behaviour between horizontal and vertical movements. When the small ballistic movements, i.e., microsaccades, are removed, the scaling behaviour in both axes becomes similar. Our findings suggest that microsaccades enhance the persistence at short time scales mostly in the horizontal component and much less in the vertical component. We also applied the phase synchronisation decay method to study the synchronisation between six combinations of binocular fixational eye movement components. We found that the vertical-vertical components of right and left eyes are significantly more synchronised than the horizontal-horizontal components. These differences may be due to the need for continuously moving the eyes in the horizontal plane in order to match the stereoscopic image for different viewing distances.
Y1  - 2008
UR  - 1960 = DOI: 10.1140/epjst/e2008-00762-3
SN  - 1951-6355
ER  - 
TY  - JOUR
A1  - Lindenberger, Ulman
A1  - Brehmer, Y.
A1  - Kliegl, Reinhold
A1  - Baltes, Paul B.
T1  - Benefits of graphic design expertise in old age : compensatory effects of a graphical lexicon?
Y1  - 2008
SN  - 978-0-521-87205-8
ER  - 
TY  - JOUR
A1  - Laubrock, Jochen
A1  - Engbert, Ralf
A1  - Kliegl, Reinhold
T1  - Fixational eye movements predict the perceived direction of ambiguous apparent motion
N2  - Neuronal activity in area LIP is correlated with the perceived direction of ambiguous apparent motion (Z. M. Williams, J. C. Elfar, E. N. Eskandar, L. J. Toth, & J. A. Assad, 2003). Here we show that a similar correlation exists for small eye movements made during fixation. A moving dot grid with superimposed fixation point was presented through an aperture. In a motion discrimination task, unambiguous motion was compared with ambiguous motion obtained by shifting the grid by half of the dot distance. In three experiments we show that (a) microsaccadic inhibition, i.e., a drop in microsaccade frequency precedes reports of perceptual flips, (b) microsaccadic inhibition does not accompany simple response changes, and (c) the direction of microsaccades occurring before motion onset biases the subsequent perception of ambiguous motion. We conclude that microsaccades provide a signal on which perceptual judgments rely in the absence of objective disambiguating stimulus information.
Y1  - 2008
UR  - http://www.journalofvision.org/content/by/year
U6  - https://doi.org/10.1167/8.14.13
SN  - 1534-7362
ER  -