Three-channel Lissajous′ trajectories of auditory event-related potentials to target stimuli

J. Attias, H. Pratt

Research output: Contribution to journalArticlepeer-review


Three orthogonal recordings ('X', 'Y' and 'Z') of event-related potentials (ERPs) evoked by auditory target stimuli were represented in 3-dimensional voltage-space, to produce 3-channel Lissajous′ trajectories (3-CLTs). Stimuli were verbal or non-verbal and were differentiated by their pitch, phonemic or phonetic attributes. Visual inspection and quantitative evaluations unexpectedly revealed that the 3-CLT of these ERPs strongly resembles a 'hair-pin' trajectory. This trajectory tilted in space at characteristic angles with each of the analysis axes: 133° with the 'X' axis, 87° with the 'Y' axis, and 54° with the 'Z' axis. The relatively small inter-subject variability observed in the geometrical measures, particularly in orientation, may be attributed to the slight variation in the underlying generators. 3-CLT analysis could be useful in future clinical as well as source studies of ERP generators.

Original languageEnglish
Pages (from-to)127-133
Number of pages7
JournalElectroencephalography and Clinical Neurophysiology/ Evoked Potentials
Issue number2
StatePublished - 1990
Externally publishedYes


  • Auditory event-related potentials
  • Human P300
  • Three-channel Lissajous' trajectory

ASJC Scopus subject areas

  • Neuroscience (all)
  • Clinical Neurology


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