Animations of Auditory Hallucination

Research undertaken by Per Line (Alias Peter)
Graphics and animation by Paul Bourke

This study was undertaken as part of a PhD program within the Centre for Applied Neurosciences (now known as the Brain Sciences Institute), Swinburne University of Technology and was based on a collaboration between the Mental Health Research Institute of Victoria and the Brain Sciences Institute.


The dynamic features of the steady state visually evoked potential (SSVEP) topography associated with the onset of spontaneous auditory hallucinations in 8 schizophrenic patients was examined as part of a PhD project. The SSVEP was recorded from 64 electrode sites and elicited by a spatially uniform flicker. The finding of greatest significance from this study was the strong and consistent SSVEP latency decrease in the right temporo/parietal region in a pooled average of the SSVEP time series associated with the onset of spontaneous auditory hallucinations in the eight schizophrenic patients. This latency decrease occurred about a second or so prior to the button press indicating the onset of the auditory hallucinations by the patients.

Right view -- Top view
(SSVEP Latency and Hotelling's T)


A Control Task investigating the effect of responding on the SSVEP topography found no similar effect in the same region. The colour mapping in the animations has been independently scaled and therefore a comparison between the magnitudes of the SSVEP latency and the Hotelling's T between the two tasks will be misleading.

Right view -- Top view
(SSVEP Latency and Hotelling's T)