Table 1
CRC 1280 metadata schema, M = mandatory, O = Optional.
| ID | FIELD NAME | OBLIGATION | DESCRIPTION | CONSTRAINTS OR CONTROLLED VOCABULARIES |
|---|---|---|---|---|
| 1 | Group ID | M | internal ID of CRC research group | controlled vocabulary: A01, A02, A03, A04, A05, A06, A07, A08, A09, A10, A11, A12, A13, A14, A15, A16, A18, A19, A21, F01, F02 |
| 2 | Experiment Title | M | title of the experiment | free text entry |
| 3 | Creator | M | main experimenter(s) or collector(s) of data | use of specific delimiters to separate first and last name and individuals |
| 4 | Contributor | M | other experimenters or individuals involved | use of specific delimiters to separate first and last name and individuals |
| 5 | Record Date | M | date when the data were collected or recorded | ISO 8601 date format |
| 6 | Resource Type | M | type of data | controlled vocabulary: Analysed, Measured, Simulated |
| 7 | Modality | M | characteristics of the data | controlled vocabulary: Behavioral, ECG|Pulse, EDA, EEG, Eyetracking, Histology, Hormone Measurements, LFP, MRI, Questionnaires, Respiration, Single cell recording, TMS |
| 8 | Shared With | M | CRC group ID to share data with | controlled vocabulary: A01, A02, A03, A04, A05, A06, A07, A08, A09, A10, A11, A12, A13, A14, A15, A16, A18, A19, A21, F01, F02 |
| 9 | Experiment Description | M | short scientific abstract of the experiment | free text entry |
| 10 | Subject ID | M | ID that uniquely identifies each subject | for human subjects: the 11-digit CRC subject code (Diers et al., 2023) |
| 11 | Subject Species | M | species of the subject studied in the experiment | controlled vocabulary: Humans, Pigeons, Mice, Rats, Crows, Jackdaws |
| 12 | Subject Type | M | characteristics of the subject in the context of the experiment | controlled vocabulary: Healthy test subject, Patient, Healthy control subject |
| 13 | Subject Sex | M | specification of the sex | controlled vocabulary: male, female, diverse, undefined |
| 14 | Subject Age | M | age of the test subject | in years |
| 15 | Animal/Ethics Approval No. | M | official number or code of the animal/ethics approval | free text entry |
| 16 | Extra Information | O | any extra information of relevance e.g., subject exclusions | free text entry |
[i] Note: For the mappings to Dublin Core and DataCite, please refer to the Supplement, Table A.

Figure 1
Example of structured folder hierarchy in the CRC data model incorporating the levels CRC Group, Experiment, Subject, Session, and Modality.

Figure 2
Primary interface of the MetaDataApp with exemplary entries: Opening the MetaDataApp in the Modality folder, only the Modality needs to be selected. The other metadata are automatically copied from the higher folder levels.
