Objective response detection in the frequency domain

Robert A. Dobie, Michael J. Wilson

Research output: Contribution to journalArticlepeer-review

85 Scopus citations


Several different and related measures have been proposed for objective response detection in the frequency domain. We compared magnitude-squared coherence (MSC) to phase coherence (PC) using simulations with specified signal-to-noise ratios (SNRs) and varying numbers of subaverages; the performance measure was area unde a receiver operating characteristic (ROC) curve. MSC was superior to PC; test time required for equivalent performance is about 3 times greater PC than for MSC. MSC performance for a given final SNR increased with the number of subaverages, but reached a plateau at 16 subaverages. Simulations of noise non-stationarity (high-amplitude noise in some subaverages compared to the others) led to decreased performance advantage for MSC over PC. However, weighted averaging restored this advantage. MSC is shown to be a simple algebraic transform of Victor and Mast's (1991) "circular T2" statistic and of two earlier statistics; all have identical statistical power.

Original languageEnglish (US)
Pages (from-to)516-524
Number of pages9
JournalElectroencephalography and Clinical Neurophysiology/ Evoked Potentials
Issue number6
StatePublished - 1993


  • Coherence
  • Evoked potentials
  • Hotelling T test
  • Magnitude-squared coherence
  • Objective response detection
  • Phase coherence

ASJC Scopus subject areas

  • Neuroscience(all)
  • Clinical Neurology


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