Dr. Sven Ohl
Profil
Zusammenfassung
Dr. Sven Ohl erforscht, wie das Auge und der Körper zusammenwirken, um visuell relevante Informationen zu verarbeiten und zu speichern. Seine Expertise umfasst die Mechanismen von Augenbewegungen, visuelles Kurzzeitgedächtnis und die Kopplung zwischen körperlichen Prozessen (wie Herzschlag) und Wahrnehmung. Diese Erkenntnisse sind praktisch relevant für die Optimierung von Mensch-Maschine-Schnittstellen, die Rehabilitation von Sehstörungen und das Verständnis von Aufmerksamkeitsprozessen in komplexen visuellen Aufgaben.
Skills
Stammdaten
Identität, Organisation und Kontakt aus HU-FIS.
Forschungsthemen5
Der Einfluss von Bewegungen auf die Aufrechterhaltung von Informationen im visuellen Gedächtnis
Quelle ↗Förderer: DFG Eigene Stelle (Sachbeihilfe) Zeitraum: 05/2016 - 09/2019 Projektleitung: Dr. Sven Ohl
DFG-Sachbeihilfe: Der Einfluss von Bewegung auf die Aufrechterhaltung von Informationen im visuellen Gedächtnis
Quelle ↗Förderer: DFG Sachbeihilfe Zeitraum: 05/2016 - 04/2019 Projektleitung: Prof. Dr. phil. Martin Rolfs, Dr. Sven Ohl
Die Aktualisierung visueller Gedächtnisinhalte bei Bewegungen
Quelle ↗Förderer: DFG Eigene Stelle (Sachbeihilfe) Zeitraum: 10/2019 - 05/2023 Projektleitung: Dr. Sven Ohl, Prof. Dr. phil. Martin Rolfs
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Publikationen25
Top 25 nach Zitationen — Quelle: OpenAlex (BAAI/bge-m3 embedded für Matching).
Psychophysiology · 83 Zitationen · DOI
Perception and cognition oscillate with fluctuating bodily states. For example, visual processing has been shown to change with alternating cardiac phases. Here, we study the heartbeat's role for active information sampling-testing whether humans implicitly act upon their environment so that relevant signals appear during preferred cardiac phases. During the encoding period of a visual memory experiment, participants clicked through a set of emotional pictures to memorize them for a later recognition test. By self-paced key press, they actively prompted the onset of short (100 ms) presented pictures. Simultaneously recorded electrocardiograms allowed us to analyze the self-initiated picture onsets relative to the heartbeat. We find that self-initiated picture onsets vary across the cardiac cycle, showing an increase during cardiac systole, while memory performance was not affected by the heartbeat. We conclude that active information sampling integrates heart-related signals, thereby extending previous findings on the association between body-brain interactions and behavior.
Journal of Neuroscience · 82 Zitationen · DOI
During visual fixation, the eye generates microsaccades and slower components of fixational eye movements that are part of the visual processing strategy in humans. Here, we show that ongoing heartbeat is coupled to temporal rate variations in the generation of microsaccades. Using coregistration of eye recording and ECG in humans, we tested the hypothesis that microsaccade onsets are coupled to the relative phase of the R-R intervals in heartbeats. We observed significantly more microsaccades during the early phase after the R peak in the ECG. This form of coupling between heartbeat and eye movements was substantiated by the additional finding of a coupling between heart phase and motion activity in slow fixational eye movements; i.e., retinal image slip caused by physiological drift. Our findings therefore demonstrate a coupling of the oculomotor system and ongoing heartbeat, which provides further evidence for bodily influences on visuomotor functioning. SIGNIFICANCE STATEMENT: In the present study, we show that microsaccades are coupled to heartbeat. Moreover, we revealed a strong modulation of slow eye movements around the R peak in the ECG. These results suggest that heartbeat as a basic physiological signal is related to statistical modulations of fixational eye movements, in particular, the generation of microsaccades. Therefore, our findings add a new perspective on the principles underlying the generation of fixational eye movements. Importantly, our study highlights the need to record eye movements when studying the influence of heartbeat in neuroscience to avoid misinterpretation of eye-movement-related artifacts as heart-evoked modulations of neural processing.
Journal of Experimental Psychology Learning Memory and Cognition · 75 Zitationen · DOI
Visual short-term memory (VSTM) is a crucial repository of information when events unfold rapidly before our eyes, yet it maintains only a fraction of the sensory information encoded by the visual system. Here, we tested the hypothesis that saccadic eye movements provide a natural bottleneck for the transition of fragile content in sensory memory to VSTM. In 4 experiments, we show that saccades, planned and executed after the disappearance of a memory array, markedly bias visual memory performance. First, items that had appeared at the saccade target were more readily remembered than items that had appeared elsewhere, even though the saccade was irrelevant to the memory task (Experiment 1). Second, this influence was strongest for saccades elicited right after the disappearance of the memory array and gradually declined over the course of a second (Experiment 2). Third, the saccade stabilized memory representations: The imposed bias persisted even several seconds after saccade execution (Experiment 3). Finally, the advantage for stimuli congruent with the saccade target occurred even when that stimulus was far less likely to be probed in the memory test than any other stimulus in the array, ruling out a strategic effort of observers to memorize information presented at the saccade target (Experiment 4). Together, these results make a strong case that saccades inadvertently determine the content of VSTM, and highlight the key role of actions for the fundamental building blocks of cognition. (PsycINFO Database Record
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