What is the minimum duration of a K complex?

What is the minimum duration of a K complex?

• A. 0.5 seconds
• B. 1 second
• C. 0.25 seconds
• D. 1.5 seconds

Answer: (A)

A K-complex is defined by its clear, large, biphasic shape with a sharp negative deflection followed by a slower positive component, occurring most often during N2 sleep and sometimes in response to stimuli. A key scoring criterion is its duration: it must last at least half a second. This minimum duration helps distinguish genuine K-complexes from shorter transient spikes or artifacts. So the smallest duration that still qualifies as a K-complex is half a second. Longer-lasting complexes can still be K-complexes if they meet the same waveform criteria, but the question asks for the minimum. Shorter events do not meet the criterion.

A K-complex is defined by its clear, large, biphasic shape with a sharp negative deflection followed by a slower positive component, occurring most often during N2 sleep and sometimes in response to stimuli. A key scoring criterion is its duration: it must last at least half a second. This minimum duration helps distinguish genuine K-complexes from shorter transient spikes or artifacts. So the smallest duration that still qualifies as a K-complex is half a second. Longer-lasting complexes can still be K-complexes if they meet the same waveform criteria, but the question asks for the minimum. Shorter events do not meet the criterion.