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Chem. Senses 29: 137-142, 2004
© Oxford University Press 2004

Temporal Integration in Nasal Lateralization and Nasal Detection of Carbon Dioxide

Paul M. Wise1, Tomas Radil1,2 and Charles J. Wysocki1

1 Monell Chemical Senses Center, Philadelphia, PA, USA 2 Institute of Physiology, Czech Academy of Sciences, Prague, Czech Republic

Correspondence to be sent to: Paul M. Wise, Monell Chemical Senses Center, 3500 Market Street, Philadelphia, PA 19104, USA. e-mail: pwise{at}monell.org

Two experiments examined time/concentration trading for the detection of carbon dioxide, an irritant with little or no odor. Experiment 1 employed the nasal lateralization method: subjects attempted to determine which nostril received carbon dioxide and which received pure air when presented simultaneously. Experiment 2 employed a temporal, two-alternative, forced-choice, detection paradigm with monorhinal stimulation. In both experiments, stimulus duration was varied at a number of fixed concentrations to determine the shortest, detectable pulse. Under both conditions, threshold pulse duration decreased as stimulus concentration increased. Power functions with exponents of less than negative one described the data quite well: More than a twofold increase in duration was needed to compensate for a twofold decrease in concentration. Thus, for carbon dioxide, the nasal trigeminal system functions as an imperfect integrator at threshold-level.

Key words: chemesthesis, psychophysics, sensitivity, trigeminal


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