Signatures of depression in non-stationary biometric time series.

This paper is based on a discussion that was held during a special session on models of mental disorders, at the NeuroMath meeting in Stockholm, Sweden, in September 2008. At this occasion, scientists from different countries and different fields of research presented their research and discussed open questions with regard to analyses and models of mental disorders, in particular depression. The content of this paper emerged from these discussions and in the presentation we briefly link biomarkers (hormones), bio-signals (EEG) and biomaps (brain-maps via EEG) to depression and its treatments, via linear statistical models as well as nonlinear dynamic models.

Investigation of P300 in various forms of epilepsy.

The problem of the late EP components generator localization has not yet been solved. This study aims to find out if a focal cortical epilepsy of the frontal (FLE) or of the temporal lobe (TLE) can modify the P300 component of the evoked response (either visual or auditory). Our data rely mainly on the selective differentiation test of an 80 dB click alternatively applied on the right or left ear, the patient having to give a motor response to those stimuli which have been chosen as target stimuli (probability of administration, 1:4).

Cerebral evoked potentials in the chronic vertebrobasilar insufficiency.

The syndrome of chronic vertebrobasilar insufficiency (VBI) consists in a complex of symptoms, often mild and transient, and lacks a complementary system of objective paraclinical investigations able to certify its existence. The study of somato-sensory, auditory and visual evoked potentials in VBI showed the occurrence of changes regardless of the symptom importance both in disorders due to extrinsic causes: a) compression by a damage of the cervical column (92.9%, 50% and 63.

Mapping of VEPs and ERG responses to punctual stimulations in the visual field.

Visual field projection maps were obtained using retinal and cortical EP amplitude values. Single meridian investigations were also performed. Stimulation was done with punctual photic stimuli delivered by the LED perimeter built for the purpose.

LED perimeter for visual field analysis by mapping of small field evoked potentials.

A new type of visual field perimeter, equipped with conic light emitting diodes (LEDs) located at 10 degrees intervals automatically programmable is described. The device is meant for visual field analysis by mapping of the evoked responses derived from the retina and specific cortical projection areas.