The University of Liverpool
Department of Mathematical Sciences
Division of Statistics and Probability
SEMINAR
Multiresolution Karhunen-Loeve Analysis of Psycho- Physiological Signals
Dr Lara Fontanella
Wednesday, 30th April, 2pm
The Whittaker Room (211)
Abstract:
The Autonomic Nervous System (ANS) and particularly its sympathetic division has been the object of intense study in neurophysiology and psychophysiology. Electro-Dermal Activity (EDA) has been the gold standard for peripheral monitoring of sympathetic responses. EDA is usually measured through the Galvanic Skin Response (GSR), which is a simple and reproducible method for quantifying sweat gland activation. In fact, sweat glands distributed on the skin receive inputs from the sympathetic nervous system only, and thus provide a good indication of arousal level due to external sensory and cognitive stimuli.
In recent years, however, it has also been shown that during arousal additional physiological signs materialize on the face and are ubiquitous manifestations of stress. To this purpose, we also consider a thermal imaging signal which is extracted from the perioral (maxillary) facial area and, within a classic repeated arousal experiment, analyse its characteristics for a meaningful comparative study with GSR.
Specifically, we propose a multiresolution Karhunen-LoŽeve expansion methodology (MR-KL) for frequency exploratory analysis of thermal and GSR signals and show that monitoring of the facial channel yields similar detecting power to GSR’s.
Following the talk, tea and biscuits will be available in Room 304
ALL WELCOME
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Ingrid Harper
Division of Statistics and Probability
Department of Mathematical Sciences
University of Liverpool
Mathematical Sciences Building
Peach Street
Liverpool L69 7ZL
Tel: 0151 794 4751
Fax: 0151 794 4754
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