11:00 - 12:30
Parallel sessions 8
11:00 - 12:30
Room: HSZ - N1
Chair/s:
Philine Margarete Baumert, Celina Kullmann
Oculomotor research has a long tradition in experimental psychology. In humans, visual input provides the highest amount of information per time in comparison to other senses, and about 50% of the neocortex reacts to visual stimuli. With today’s technology, eye movements are easy to access, do not rely on participants’ subjective reports, and usually do not require complicated task instructions. Their neural basis, both neurochemical and neurophysiological, has been studied extensively. Therefore, they can provide insights into health and disease, numerous aspects of cognition, and can be viewed as an estimate of brain functioning. Despite the field’s long history, new methods and technologies open up new possibilities and questions, as well as new pathways to solving well-known problems. Here, we aim to present current methods, approaches, and directions in the field of oculomotor research in experimental psychology. First, Celina Kullmann will introduce the method of latent state-trait modelling and resulting reliability as well as trait and state components of smooth pursuit eye movements. Next, Paul Schmitthäuser will speak on how a new experimental paradigm makes use of saccadic inhibition to assess oculomotor planning and attentional priority. Keaton Dahl will contribute new insights into fixational eye movements and how specific statistical methods can be applied to them in face recognition tasks. Then, Philine Baumert will present findings on how lorazepam influences microsaccades during fixational and exploratory gaze behavior. As a final contribution, Alexander Goettker will shed light on the statistics of natural gaze behavior using mobile recordings and how they compare to laboratory-gained estimates. Overall, the symposium will demonstrate new perspectives as well as recent progress in exciting areas of oculomotor research, underscoring its continued relevance to the field of experimental psychology.
Submission 202
Fixational Eye Movements and Microsaccade Statistics During Face Recognition
SymposiumTalk-03
Presented by: Keaton Dahl
Keaton DahlAnke CajarRalf Engbert
University of Potsdam, Germany
Recently it was found that microsaccade statistics could be used to differentiate visual self-recognition from processing of other people’s faces (Schwetlick et al., 2025). In the current study we reevaluated this effect using several oculomotor statistics based on high-resolution (1000 Hz) binocular eye-tracking data. The study seeks to capture subtle temporal and spatial patterns that differentiate between viewing one’s own face from viewing the face of a stranger. We developed a multi-stage processing pipeline to detect and organize properties of microsaccades (rates, amplitudes, trajectories) and slow components of fixational eye movements (diffusion constants, Hurst exponent). Using stimulus-locked analyses, we show that this approach allows for the quantification of microsaccade parameters and their relationship to visual attention and face processing. As a potential application we suggest that involuntary, fine-grained oculomotor responses can serve as biometric signatures of self-identification.