17:00 - 18:30
Talk Session 3
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17:00 - 18:30
Mon—HZ_2—Talks3—26
Mon-Talks3
Room:
Room: HZ_2
Chair/s:
Alexander Goettker
Exploring the neural basis of individual gaze in complex scenes
Mon—HZ_2—Talks3—2606
Presented by: Diana Kollenda
Diana Kollenda 1, 2*Elaheh Akbarifathkouhi 1Maximilian Broda 1, 2Benjamin de Haas 1, 2
1 Experimental Psychology, Justus Liebig University, Giessen, Germany, 2 Center for Mind, Brain and Behavior (CMBB), Marburg and Giessen, Germany
Recent research has demonstrated systematic individual differences in gaze patterns during free viewing of complex scenes, especially in fixating faces and text. What is the neural basis of these individual biases? Developmental studies in humans and non-human primates suggest ties between category-specific salience and neural preferences in the ventral stream. We conducted a two-part study: an eye-tracking session where participants freely viewed 700 complex scenes, followed by an fMRI session using a standard localizer paradigm to identify object-category-specific activity (e.g., faces, text) in the inferior temporal cortex (IT). Our participants (n = 26; target = 60) showed reliable differences in fixation biases towards faces and text. We also observed substantial individual differences in the distinctiveness of corresponding patterns of IT activity, a measure that has recently been associated with the development of category-specific neural preferences. Notably, we found first evidence suggestive of a link between the immediate attraction of gaze towards faces and text during free-viewing and the distinctiveness of corresponding IT-patterns in the fMRI session (text: r = .41, p = .04; faces: r = .37, p = .07). This preliminary result suggests that people with a stronger tendency to fixate faces or text also have a more distinct representation of the corresponding stimulus category in the ventral stream. Furthermore, we plan to test a potential relationship between spatial individual saccadic biases and corresponding anisotropies in early visual field maps. Taken together, we hope to learn how individual brains shape individual gaze and, ultimately, our perception of the world.
Keywords: individual differences, eye movements, neuroimaging, fMRI, behavior, complex scenes