Update ephys.md (#1681)

src/derivatives/ephys.md

@@ -5,16 +5,16 @@ This includes minimally processed data, but excludes data that has undergone ext
 
 ## Minimally processed  electrophysiological data
 
-A minimally processed EEG, MEG or iEEG data can be stored as a derivative, using the same file formats as specified for raw EEG, MEG, or iEEG.
-Examples for this are MaxFiltered MEG data, or re-referenced and bandpass-filtered EEG data.
+A minimally processed EEG, MEG or iEEG data can be stored as a derivative using the same file formats as specified for raw EEG, MEG, or iEEG.
+Examples of this are MaxFiltered MEG data or re-referenced and bandpass-filtered EEG data.
 Certain file formats that are allowed in BIDS for raw data have limited representation to some extent,
-for example the EDF and BDF formats cannot be used to store epoched (or "segmented") data in a standardized way,
-whereas the BrainVision and FIF file formats can.
+for example, the EDF and BDF formats cannot be used to store epoched (or "segmented") data in a standardized way,
+whereas the EEGLAB .set, the BrainVision Core Data Format 1.0 and the FIF file formats can.
 These limitations should be taken into account when writing derivative data back to disk.
-The representation of the data MUST follow the general derivative conventions and the Common file level metadata fields,
+The representation of the data MUST follow the general derivative conventions and the Common file-level metadata fields,
 notably the use of the [`desc` entity](../appendices/entities.md#desc).
 
-If minimally processed data is the result from processing a BIDS dataset, then it MUST be marked as a derivative and the source data must be specified.
+If minimally processed data is the result of processing a BIDS dataset, then it MUST be marked as a derivative dataset in the dataset_description.json file, and the source data must be specified.
 The processing steps MUST be indicated in the [`desc` entity](../appendices/entities.md#desc),
 where the label is a description identifier that distinguishes it from the original raw data.
 
@@ -26,12 +26,12 @@ the [`desc` entity](../appendices/entities.md#desc) is not needed to distinguish
 
 The description of the processing in the derivative MUST be clarified in the [descriptions.tsv](common-data-types.md#descriptions-tsv) file,
 with at least two columns for desc_id and the actual description.
-Other columns MAY be added but are at this moment not standardized.
+Other columns MAY be added but are, at this moment, not standardized.
 The [descriptions.tsv](common-data-types.md#descriptions-tsv) file SHOULD include sufficient information to document the details of the data processing that resulted in the derivative.
 
 The `_eeg.json`, `_meg.json`, or `_ieeg.json` sidecar files MUST be replicated alongside the respective derivative `_eeg.<ext>`, `_meg.<ext>`, or `_ieeg.<ext>` data files,
 so that they can be processed as if it were a raw BIDS dataset.
-The json sidecar file must be compliant with those for raw data and SHOULD NOT include fields that are specific to the processing that was done on the data.
+The JSON sidecar file must be compliant with those for raw data and SHOULD NOT include fields that are specific to the processing that was done on the data.
 
 ## MaxFiltered MEG data