{"684089":{"#nid":"684089","#data":{"type":"event","title":"PhD Proposal by Sina Dabiri","body":[{"value":"\u003Cp\u003ESina Dabiri\u003Cbr\u003EBME PhD Proposal Presentation\u003Cbr\u003E\u003Cbr\u003E\u003Cstrong\u003EDate\u003C\/strong\u003E: 2025-08-28\u003Cbr\u003E\u003Cstrong\u003ETime\u003C\/strong\u003E: 2pm\u003Cbr\u003E\u003Cstrong\u003ELocation \/ Meeting Link\u003C\/strong\u003E: Whitaker Bldg, McIntire Conference Rm\u003Cbr\u003E\u003Cbr\u003E\u003Cstrong\u003ECommittee Members:\u003C\/strong\u003E\u003Cbr\u003EZachary Danziger, Thackery Brown, Farzaneh Najafi, May Wang, Tansu Celikel, Audrey Sederberg\u003Cbr\u003E\u003Cbr\u003E\u003Cbr\u003E\u003Cstrong\u003ETitle\u003C\/strong\u003E: Recovering Frequency-Aware Latent Dynamics of Repetition Suppression in Multisensory EEG\u003Cbr\u003E\u003Cbr\u003E\u003Cstrong\u003EAbstract:\u003C\/strong\u003E\u003Cbr\u003ETemporal predictability modulates cortical dynamics and underlies repetition suppression (RS), yet linking macroscopic electrophysiological signatures to circuit-level dynamics remains methodologically challenging. Using an existing EEG dataset collected with auditory-cue\/tactile-probe protocols that manipulate sensory predictability, this dissertation will develop and validate frequency-aware dimensionality-reduction analyses to recover network-specific dynamics that mediate bottom-up sensory processing and top-down attentional control. We initially validated PCA\/TCA, ICA, UMAP, and Autoencoder pipelines using synthetic neural data driven by dynamic latent variables (i.e., temporal smoothing (\u03c4) options in Morrell Model), which guided our selection of, dimensionality-reduction method and reconstruction diagnostics. Preliminary analyses on empirical and synthetic data indicate that commonly used linear approaches (PCA\/ICA) reliably capture low-frequency structure but systematically underrepresent power above \u22488 Hz, produce negative R\u00b2 in the gamma band (30\u201350 Hz) for \u03c4 = 0.5 and 1.0 s, and yield modest coherence between recovered components and ground truth (\u22480.15\u20130.4). Perturbation analyses show that reconstruction fidelity is highly sensitive to \u03c4, and that simple per-frequency confidence-thresholding across parameter sweeps fails to rescue high-frequency recovery. In the proposed work, I will first examine the recoverability and interpretability of latent variables inferred from a synthetic EEG data and then spatiotemporal EEG data across the multisensory and uncertainty contrasts in the dataset, with particular emphasis on delineating parameter regimes and empirical constraints that determine when recovered dynamics can be linked to early sensorimotor processing (central regions) versus later frontal attentional engagement. Outcomes will include systematic characterizations of method performance across frequency bands, empirically grounded limits on interpreting high-frequency latent structure, and open-source code and notebooks to support reproducible analysis. These contributions aim to reduce methodological ambiguity in latent-state studies of spatiotemporal EEG data and to examine the link between latent electrophysiological states and cognitive variables arising from temporal and stimulus uncertainty.\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E","summary":"","format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003ERecovering Frequency-Aware Latent Dynamics of Repetition Suppression in Multisensory EEG\u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"Recovering Frequency-Aware Latent Dynamics of Repetition Suppression in Multisensory EEG"}],"uid":"27707","created_gmt":"2025-08-22 17:09:37","changed_gmt":"2025-08-22 17:10:18","author":"Tatianna Richardson","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2025-08-28T14:00:00-04:00","event_time_end":"2025-08-28T17:00:00-04:00","event_time_end_last":"2025-08-28T17:00:00-04:00","gmt_time_start":"2025-08-28 18:00:00","gmt_time_end":"2025-08-28 21:00:00","gmt_time_end_last":"2025-08-28 21:00:00","rrule":null,"timezone":"America\/New_York"},"location":"Whitaker Bldg, McIntire Conference Rm","extras":[],"groups":[{"id":"221981","name":"Graduate Studies"}],"categories":[],"keywords":[{"id":"102851","name":"Phd proposal"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1788","name":"Other\/Miscellaneous"}],"invited_audience":[{"id":"78771","name":"Public"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}