This dataset contains intra-cranial EEG (iEEG) recordings related to the paper: "Memory-related processing is the primary driver of human hippocampal theta oscillations" by Seger et al. The study investigates the role of hippocampal theta oscillations in the human brain during navigation (during which externally oriented sensorimotor processing occurs) and during mental simulation of navigation (when no externally oriented sensorimotor processing is present). The iEEG recordings underwent the initial preprocessing steps as described in the paper and were subsequently downsampled to 250Hz for the purpose of this dataset. The files in this dataset were saved as .MAT files. The dataset includes the following zip files: “Seger_et_al_2023_iEEG_data.zip" Description of data structure: "electrode.info" contains information about subject and electrode contact - electrode.info.subject_ID : participant ID - electrode.info.elec_ID : channel ID - electrode.info.anat_loc : anatomical localization (see paper for methods) - electrode.info.hemi : hemisphere of electrode - electrode.info.env_version : paradigm version "electrode.data" contains all trial level data for this electrode (** Please note that all trial level iEEG data contains a 2 second (500 sample) buffer flanking both ends.) "electrode.data.nav_and_sim_trials" contains all the trial level data for the navigation with mental simulation trials -electrode.data.nav_and_sim_trials.trial_info : information about the navigated / mentally simulated routes (ex. Start and end store, catch trial condition) -electrode.data.nav_and_sim_trials.nav_eeg : raw eeg for each navigation trial -electrode.data.nav_and_sim_trials.nav_eeg_tVect : timeVector corresponding to raw eeg data in ms (t=0 is when the trial begins t(end) - 2000 ms is when trial ends). -electrode.data.nav_and_sim_trials.nav_position : avatar XY position for all time points during navigation trials -electrode.data.nav_and_sim_trials.sim_eeg : raw eeg for each mental simulation trial -electrode.data.nav_and_sim_trials.sim_eeg_tVect : timeVector corresponding to raw eeg data in ms (t=0 is when the trial begins t(end) - 2000 ms is when trial ends). "electrode.data.nav_practice_trials" contains all the trial level data for the navigation practice trials -electrode.data.nav_practice_trials.trial_info : information about the route navigated (ex. Start and end store) -electrode.data.nav_practice_trials.nav_eeg : raw eeg for each practice navigation trial -electrode.data.nav_practice_trials.nav_eeg_tVect : timeVector corresponding to raw eeg data in ms (t=0 is when the trial begins t(end) - 2000 ms is when trial ends). -electrode.data.nav_practice_trials.nav_position : avatar XY position for all time points during practice navigation trials "electrode.data.storefront_pres_trials" contains all the trial level data for the storefront presentation trials -electrode.data.storefront_pres_trials.eeg : raw eeg for each storefront presentation -electrode.data.storefront_pres_trials.eeg_tVect : timeVector corresponding to raw eeg data in ms (t=0 is when the trial begins t(end) - 2000 ms is when trial ends). "electrode.data.crosshair_pres_trials" contains all the trial level data for the crosshair presentation trials -electrode.data.crosshair_pres_trials.eeg : raw eeg for each crosshair presentation -electrode.data.crosshair_pres_trials.eeg_tVect : timeVector corresponding to raw eeg data in ms (t=0 is when the trial begins t(end) - 2000 ms is when trial ends).