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LowFrequencyNoise

A meta-node that obtains a ratio of low frequencies (e.g

. <7 Hz) to target frequencies (e.g. alpha band 8-12 Hz). Lower ratio values are better. This can help diagnose potentially bad channels as channels with excessively high amplitudes at low frequencies relative to known high amplitude target bands such as alpha power may indicate issues caused by various artifacts such as poor electrode contact, electrode/cable movements, electrical interference, perspiration, cardiac, etc. Version 0.0.1

Ports/Properties

data

Data to process.

  • verbose name: Data
  • default value: None
  • port type: DataPort
  • value type: Packet (can be None)
  • data direction: INOUT

window_length

Sliding window length. A longer window will yield a better estimate, but the spectrum will change more slowly and will also react more slowly to changes. Typical settings for EEG phenomena are 0.5 to 5 seconds, but for very slowly (or rapidly) changing brain dynamics, longer (or shorter) windows may be used.

  • verbose name: Sliding Window Length
  • default value: 5
  • port type: FloatPort
  • value type: float (can be None)

moving_average_window

Window length for the moving average of the final output. A longer window will yield a smoother output but will react more slowly to changes.

  • verbose name: Moving Average Window Length
  • default value: 2
  • port type: FloatPort
  • value type: float (can be None)

unit

Unit in which the window length and moving average window are given.

  • verbose name: Unit Of Measurement For Window Lengths
  • default value: seconds
  • port type: EnumPort
  • value type: str (can be None)

low_frequencies

Range of frequencies for the bandpass filter for the low frequency noise.

  • verbose name: Low Frequencies
  • default value: [1, 7]
  • port type: ListPort
  • value type: list (can be None)

target_frequencies

Range of frequencies for the bandpass filter for the target range (e.g . alpha band).

  • verbose name: Target Frequencies
  • default value: [8, 12]
  • port type: ListPort
  • value type: list (can be None)

frequencies

Range of frequencies for the bandpass filter for the target range (e.g . alpha band).

  • verbose name: Frequencies
  • default value: [8, 12]
  • port type: ListPort
  • value type: list (can be None)

set_breakpoint

Set a breakpoint on this node. If this is enabled, your debugger (if one is attached) will trigger a breakpoint.

  • verbose name: Set Breakpoint (Debug Only)
  • default value: False
  • port type: BoolPort
  • value type: bool (can be None)

metadata

User-definable meta-data associated with the node. Usually reserved for technical purposes.

  • verbose name: Metadata
  • default value: {}
  • port type: DictPort
  • value type: dict (can be None)