Dokument: Post-Saccadic Error Processing in Sensorimotor and Visual Recalibration

Titel:	Post-Saccadic Error Processing in Sensorimotor and Visual Recalibration
URL für Lesezeichen:	https://docserv.uni-duesseldorf.de/servlets/DocumentServlet?id=69682
URN (NBN):	urn:nbn:de:hbz:061-20250520-105342-8
Kollektion:	Dissertationen
Sprache:	Englisch
Dokumententyp:	Wissenschaftliche Abschlussarbeiten » Dissertation
Medientyp:	Text
Autor:	Tyralla, Sandra Nicole [Autor]
Dateien:	[Dateien anzeigen] Adobe PDF [Details] 3,31 MB in einer Datei [ZIP-Datei erzeugen] Dateien vom 19.05.2025 / geändert 19.05.2025
Beitragende:	Zimmermann, Eckart [Gutachter] Bellebaum, Christian [Gutachter]
Stichwörter:	saccadic eye movements, post-saccadic error, motor recalibration, visual recalibration
Dewey Dezimal-Klassifikation:	100 Philosophie und Psychologie » 150 Psychologie
Beschreibung:	Saccadic eye movements bring stimuli of interest onto the fovea to improve the perception of the environment. However, imprecise saccades lead to post-saccadic errors, defined as the difference between target and saccade landing position. These errors provide crucial spatial information which the sensorimotor system uses to refine movement execution and sustain perceptual stability. In saccadic adaptation paradigms, artificially induced post-saccadic errors elicit saccade amplitude adjustments to compensate for persistent discrepancies. On a single trial level, serial dependence reflects how current perception is shaped by previously perceived sensory input, e.g., by post-saccadic errors. In the present dissertation, post-saccadic errors were systematically manipulated in three behavioral eyetracking studies to examine their contributions to both saccade-to-saccade and saccade-to-vision recalibration processes. Study 1 assessed whether motor and visual recalibration were better explained by the shared resource model, assuming common neural structures for processing action and perception, or the active recalibration model, assuming independent yet interacting neural structures. To test these contrasting models, saccadic adaptation was induced, followed by “no error” trials, in which either the retinal error, defined as the difference between saccade landing position and visual target, or the prediction error, defined as the difference between predicted and actual saccadic landing position, was set to zero. These “no error” trials were intermixed with visual localization trials. Although saccadic adaptation remained robust, visual mislocalization decreased as a function of the number of trials with the retinal error set to zero and was entirely abolished with the prediction error set to zero. These findings suggest that motor and visual recalibration operate independently yet interactively, supporting the active recalibration model. Study 2 assessed whether recalibration occurred through trial-by-trial integration of the post-saccadic error by assessing serial dependence under target uncertainty. Participants executed saccades towards Gaussian blobs with manipulated visuospatial uncertainty and target contrast. Reductions in saccade amplitude were observed only when the current target was uncertain, the preceding target was certain and contrast was held constant. These results imply that pre-saccadic target features (e.g., size and contrast) modulate the post-saccadic error influence on subsequent saccade amplitudes. Study 3 assessed whether endogenous or exogenous attention shifts, elicited by voluntary or delayed saccades, respectively, produced distinct patterns in sensorimotor and visual serial dependence. Sensorimotor serial dependence, assessed via saccate-to saccade amplitude adjustments, was more pronounced following voluntary saccades whereas visual serial dependence, assessed via an orientation judgment task, did not vary as a function of saccade type. This dissociation underscores the divergent impact of attentional mechanisms on sensorimotor but not visual serial dependence. To conclude, the results support the active recalibration model over the shared resource model, shown by distinct saccade-to-saccade and saccade-to-vision recalibration patterns and provide novel insights into post-saccadic error integration in a serial-dependent way to stabilize visual perception and motor control.
Lizenz:	Dieses Werk ist lizenziert unter einer Creative Commons Namensnennung 4.0 International Lizenz
Fachbereich / Einrichtung:	Mathematisch- Naturwissenschaftliche Fakultät » WE Psychologie
Dokument erstellt am:	20.05.2025
Dateien geändert am:	20.05.2025
Promotionsantrag am:	11.03.2025
Datum der Promotion:	15.05.2025