{"dataset":{"id":"61103","dataset_id":"on005522","name":"Spatial Navigation Memory of Object Locations","description":"This dataset comprises intracranial electrophysiological recordings and behavioral data from a spatial navigation memory task conducted across multiple clinical sites. Participants encoded object locations during guided navigation learning phases and subsequently recalled these locations during self-navigation test phases. The dataset includes 50 trials per session with counterbalanced trial blocking and provides both monopolar and bipolar iEEG recordings with anatomical coordinates.","owner_user_id":15,"status":"active","github_repo":"nemarDatasets/on005522","concept_doi":"10.82901/nemar.on005522","latest_version_doi":"10.82901/nemar.on005522.v1.0.0","created_at":"2026-06-27 07:00:59","updated_at":"2026-07-22 02:37:22","zenodo_concept_id":null,"is_sandbox":0,"visibility":"public","ezid_status":"public","enrichment_json":"{\n  \"version\": \"2.0\",\n  \"pipeline_stage\": \"enriched\",\n  \"title\": \"Spatial Navigation Memory of Object Locations\",\n  \"description\": \"This dataset comprises intracranial electrophysiological recordings and behavioral data from a spatial navigation memory task conducted across multiple clinical sites. Participants encoded object locations during guided navigation learning phases and subsequently recalled these locations during self-navigation test phases. The dataset includes 50 trials per session with counterbalanced trial blocking and provides both monopolar and bipolar iEEG recordings with anatomical coordinates.\",\n  \"methods_description\": \"Intracranial electrophysiological recordings were collected during a spatial navigation memory task consisting of learning and test phases. Learning trials involved participants being placed at random locations and automatically driven to object locations, while test trials required self-navigation to remembered object locations. Recordings were acquired using Blackrock and Medtronic systems across multiple clinical sites. Monopolar recordings were referenced (typically mastoid) and bipolar recordings followed paired electrode schemes. MNI and Talairach coordinates are provided for electrode locations.\",\n  \"license\": \"CC0\",\n  \"dataset_type\": \"raw\",\n  \"authors\": {\n    \"Haydn G. Herrema\": {},\n    \"Michael J. Kahana\": {}\n  },\n  \"keywords\": [\n    {\n      \"term\": \"intracranial EEG\"\n    },\n    {\n      \"term\": \"iEEG\"\n    },\n    {\n      \"term\": \"spatial navigation\"\n    },\n    {\n      \"term\": \"memory encoding\"\n    },\n    {\n      \"term\": \"learning\"\n    },\n    {\n      \"term\": \"object location recall\"\n    },\n    {\n      \"term\": \"electrophysiology\"\n    },\n    {\n      \"term\": \"clinical neurophysiology\"\n    },\n    {\n      \"term\": \"episodic memory\"\n    },\n    {\n      \"term\": \"multi-site\"\n    },\n    {\n      \"term\": \"virtual environment\"\n    }\n  ],\n  \"related_identifiers\": [\n    {\n      \"identifier\": \"https://github.com/nemarDatasets/on005522\",\n      \"identifier_type\": \"URL\",\n      \"relation_type\": \"IsDescribedBy\"\n    },\n    {\n      \"identifier\": \"https://nemar.org/dataset/on005522\",\n      \"identifier_type\": \"URL\",\n      \"relation_type\": \"IsDescribedBy\"\n    },\n    {\n      \"identifier\": \"10.18112/openneuro.ds005522\",\n      \"identifier_type\": \"DOI\",\n      \"relation_type\": \"IsVersionOf\"\n    },\n    {\n      \"identifier\": \"10.18112/openneuro.ds005522.v1.0.0\",\n      \"identifier_type\": \"DOI\",\n      \"relation_type\": \"IsDerivedFrom\"\n    }\n  ],\n  \"funding_references\": [\n    {\n      \"funder_name\": \"DARPA\",\n      \"award_number\": \"N66001-14-2-4032\",\n      \"award_title\": \"RAM\"\n    }\n  ],\n  \"resource_type_general\": \"Dataset\",\n  \"resource_type_specific\": \"Neuroimaging Dataset\",\n  \"modalities\": [\n    \"beh\",\n    \"ieeg\"\n  ],\n  \"sizes\": [\n    \"114.4 GB (277 files)\"\n  ],\n  \"formats\": [\n    \".edf\",\n    \".json\",\n    \".md\",\n    \".tsv\",\n    \".txt\",\n    \".yml\"\n  ],\n  \"source_hash\": \"72015f13729c4af2fa1466166b34c967032f51dcc88b14c2cf3a570cc025a847\"\n}","last_activity_at":"2026-06-27 07:00:59","source":"openneuro","source_id":"ds005522","subject_count":58,"modalities":"beh,ieeg","age_min":19,"age_max":60,"file_size":115392340076,"total_files":1302,"tasks":"YC1","metadata_columns_error":null,"staleness_warn_stage":null,"staleness_admin_notified_at":null,"authors":"Haydn G. Herrema, Michael J. Kahana","license":"CC0","readme":"[![DOI](https://img.shields.io/badge/DOI-10.82901%2Fnemar.on005522-blue)](https://doi.org/10.82901/nemar.on005522)\n\n### Spatial Navigation Memory of Object Locations\n\n#### Description\nThis dataset contains behavioral events and intracranial electrophysiological recordings from a spatial navigation memory task.  The experiment consists of participants encoding object locations during a guided navigation learning phase and then recalling the object locations during a self-navigation test phase.  The data was collected at clinical sites across the country as part of a collaboration with the Computational Memory Lab at the University of Pennsylvania.\n\nEach session contains 50 trials (2 practice and 48 experimental), and each overall \"trial\" contains 2 learning trials followed by 1 test trial with the same object at the same location.  For learning trial 1, participants are placed at a random location at a given radius from the object.  They are smoothly turned to face the object (1 s), automatically driven to the object location (3 s), and then paused at the object (1 s).  5 seconds later, participants are placed at a new random location and the process repeats for learning trial 2.  On test trials, participants are placed at a random location and orientation, with the object invisible.  They navigate to where they believe the object was located and press a button to record their response.  The environment for all sessions and trials is 64.8 x 36, with coordinates: x = (-32.4, 32.4), y = (-18.0, 18.0).\n\nThe trials are blocked by a counterbalanced scheme, so for every trial there is another trial with reflected object position, starting position, and orientation.  Each block contains 2 trials (i.e., 2 x (2 learning, 1 test)), with object (X, Y) and starting locations (x, y):\n- **(X1, Y1)**\n    - **(x1', y1')**\n    - **(x1'', y1'')**\n    - **(x1''', y1''')**\n- **(X2, Y2)**\n    - **(x2', y2')** \n    - **(x2'', y2'')**\n    - **(x2''', y2''')**\n\nThe paired block contains 2 trials in the opposite order with object and starting locations:\n- **(-X2, -Y2)**\n    - **(-x2', -y2')**\n    - **(-x2'', -y2'')**\n    - **(-x2''', -y2''')**\n- **(-X1, -Y1)**\n    - **(-x1', -y1')**\n    - **(-x1'', -y1'')** \n    - **(-x1''', -y1''')**\n\n#### To Note\n* The iEEG recordings are labeled either \"monopolar\" or \"bipolar.\"  The monopolar recordings are referenced (typically a mastoid reference), but should always be re-referenced before analysis.  The bipolar recordings are referenced according to a paired scheme indicated by the accompanying bipolar channels tables.\n* Each subject has a unique montage of electrode locations.  MNI and Talairach coordinates are provided when available.\n* Recordings done with the Blackrock system are in units of 250 nV, while recordings done with the Medtronic system are estimated through testing to have units of 0.1 uV.  We have completed the scaling to provide values in V.\n\n#### Contact\nFor questions or inquiries, please contact sas-kahana-sysadmin@sas.upenn.edu.","bids_version":"1.7.0","sessions_count":6,"publish_date":null,"embedding_dirty":0,"license_tier":"public","zarr_status":"ready","zarr_converted_at":"2026-08-15 05:27:43","zarr_store_count":170,"zarr_index_etag":"2949b476f0a3c87e08c64f16e726bd14","zarr_source_commit":"df8a08507c47368e161eba51885468f334944264","archive_status":null,"archive_size":null,"archive_retry_count":0,"records_status":null,"archive_skip_reason":null,"zarr_errors":6,"zarr_failure_count":6,"zarr_deterministic":1,"zarr_failed_at":"2026-08-15 05:27:43","num_dataset_citations":2,"num_datapaper_citations":0,"n_channels":null,"electrode_system":null,"has_hed":0,"hed_version":null,"is_exemplar":0,"bytes_present":114439510010,"data_complete":1,"withdrawn_at":null,"withdrawn_reason":null,"archive_complete":null,"archive_absent_files":null,"archive_declared_files":null,"zarr_pool_breaks":null,"total_recording_duration":508308,"recording_duration_min":724,"recording_duration_max":8455,"recording_count":176,"recordings_unavailable":6,"recordings_measured":170,"channel_count_min":50,"channel_count_max":188,"sampling_frequency":null,"power_line_frequency":null,"eeg_reference":null,"placement_scheme":null,"sweep_stamps":"{\"enrichment_updated_at\":\"2026-07-22 02:37:10\",\"metadata_updated_at\":\"2026-07-22 02:37:21\",\"archive_checked_at\":null,\"zarr_checked_at\":null,\"records_checked_at\":null,\"citations_updated_at\":\"2026-09-08 03:00:52\",\"channel_montage_checked_at\":\"2026-06-28 23:47:44\",\"hed_checked_at\":\"2026-06-30 05:20:55\",\"data_checked_at\":null,\"availability_report_at\":\"2026-07-23 01:25:29\",\"recording_stats_at\":\"2026-09-02 11:33:24\",\"signal_defaults_at\":\"2026-09-02 12:37:40\"}","participants":58,"num_citations":2,"latest_version":"v1.0.0","zarr_verify_status":null,"zarr_verified_at":null,"owner_username":"nemarAdmin","owner_github":"nemarAdmin","file_size_formatted":"107 GB","zarr_data_failures":{"count":6,"detail_ref":"zarr/index.json","compacted_by":"migration_0074"},"zarr_index_url":"https://zarr.nemar.org/on005522/zarr/index.json","attestation_deposit_type":null,"attestation_key_status":null,"attestation_deidentified":null,"attestation_no_duplicate":null,"attestation_upstream_source":null,"attestation_accepted_at":null}}