Description
Apply a supplied polarity reversal to a recorded EEG amplitude.
Neurological signal records distinguish event markers, sampling rate, polarity, reference amplitude and physical units. A pre-trigger duration may not equal a whole sample count, so the rounding policy changes the represented interval. Scalar subtraction and timestamp arithmetic do not detect an event, validate a recording or establish a diagnosis.
Apply a supplied polarity reversal to a recorded EEG amplitude.
When to use this tool
Use EEG Channel Polarity Record when you already have channelId, reversePolarity, suppliedAmplitude and need to apply a supplied polarity reversal to a recorded EEG amplitude.
How to use the tool and how it works
- Enter channelId, reversePolarity, suppliedAmplitude. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read recordedAmplitude, label. Use the output convention below.
Require channelId nonempty; negate the supplied amplitude only when reversePolarity=true and label the selected convention.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| channelId | Channel Id | Required. Text; minimum UTF-16 length 1; maximum UTF-16 length 8192. |
| reversePolarity | Reverse Polarity | Required. Boolean. |
| suppliedAmplitude | Supplied Amplitude | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| recordedAmplitude | Recorded Amplitude | Required. Finite number. |
| label | Label | Required. Text; maximum UTF-16 length 8192. |
{
"input": {
"channelId": "CH17",
"reversePolarity": true,
"suppliedAmplitude": 5
},
"output": {
"recordedAmplitude": -5,
"label": "CH17 [reversed]"
}
}Limitations and assumptions
- No signal is inspected, electrode orientation verified or neurological finding inferred.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Review the original signal, acquisition settings and annotation method when interpreting a recording. Use actual timestamps for variable timing and the complete reference/montage definition for signal analysis; preserve the local unit and rounding conventions.
References
Similar or alternative tools
- EEG Reference Scalar Subtraction
Subtract a supplied reference signal from one EEG channel value.
- EEG Electrode Impedance Unit
Convert a supplied electrode impedance between ohms and kiloohms.