Hierarchical Event Descriptors (HED)

Linking brain, body, behavior and experience in experiments through metadata to enable analysis

Why HED?

A very important question, for any neuroimaging time series data - What exactly happened during this recording?
HED annotations record and store detailed answers to this question with the data - in a form readable by both human and machines.

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Who can use HED?


performing experiments that acquire data

Data annotator

organizing data and tagging events

Data analyst

applying HED tools to find and analyze data

Tool developer

contributing to the growing HED toolkit

Schema builder

extending HED vocabulary in new directions