If you are experiencing problems downloading PDF or HTML fulltext, our helpdesk recommend clearing your browser cache and trying again. If you need help in clearing your cache, please click here . Still need help? Email help@ingentaconnect.com

Free Content The N550 component of the evoked K-complex: A modality non-specific response?

The full text article is temporarily unavailable.

We apologise for the inconvenience. Please try again later.

Download Article:

Abstract:

Summary

A large amplitude late negative deflection peaking between 500 and 650 ms is observable in the averaged K-complex wave-form. This peak is thus often labelled the N550. ‘N550’ appears during stage 2 and is maintained into slow wave sleep but is not apparent during REM. Most studies have employed auditory stimuli to elicit the K-complex. Two experiments were run to examine the effects of stimulus modality on the topographical distribution of the N550. In the first experiment, the K-complexes were elicited in an auditory oddball procedure. In the second experiment, K-complexes were elicited by respiratory occlusions. Twenty-nine channel recordings were used to increase spatial resolution. N550 was substantially larger in the average of trials containing K-complexes than in trials in which a K-complex could not be identified. N550 varied inversely in amplitude with the probability of accordance of the stimulus. The topographic distribution of the N550 was consistent between experiments. It was bilaterally symmetrical and was maximal over fronto-central regions of the scalp. The results indicate that the N550 reflects the activity of a modality non-specific, sleep dependent generator that responds to both interoceptive and external stimulation.

Document Type: Research Article

Publication date: December 1, 1999

Related content

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more