Perceptual Factors in Workload: A Neuromagnetic Study.
Annual rept. no. 1, 1 Jan-31 Dec 85,
NEW YORK UNIV N Y
Pagination or Media Count:
A background section describes the neuromagnetic method and its history. There were an elevation of N1 and P2 using a quasi-steady state stimulus. The fields associated with these sources increased in intensity during attention. This is not due to the activity of sources recruited during attention, but to Modulated activity of neurons in or near primary auditory cortex. This is consistent with a Triesman like filter theory of attention. Also, physical parameters of stimulation, e.q., loudness, have little or no effects. However, the effect is sharply diminished when both stimuli are presented to both ears with equal loudness. A collaboration with other investigators is planned to compare our results with results obtained in a more conventional manner. A new method for obtaining graded levels of attention is described. A visual experiment is underway, and is giving us similar results. A single-position method for determining the location, orientation and strength of the dipole source is described. This method will be applied to a P300 study, which will follow-up an odd-ball study just completed. The latter gave results similar to those obtained previously, but the method is sufficiently insensitive to determine if changing P300 latency is due to a change in source. The planned experiment should make this possible.
- Anatomy and Physiology