View source for Lambda waves

*Located in the occipital regions bilaterally as positive waves. 
*Triangular in shape (like the capital lambda: &Lambda;) and generally symmetric.
*Amplitude: 50 microV
*Duration 200-300 msec
*Present with eyes opened and during visual fixation
*Same morphology as [[POSTS (Positive occipital sharp transients of sleep)]], both in form and in occipital distribution, however POSTS are during sleep.


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'''''Lambda waves bilaterally present and absent during eyes closed (double banana)'''''
[[File: Lambda_double_banana_e.png|border|1200px|left]]Beta_e_double_banana.png
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