Brain wave and Mental picture

Brain wave noun - (neurophysiology) rapid fluctuations of voltage between parts of the cerebral cortex that are detectable with an electroencephalograph.

Mental picture and brain wave are semantically related. In some cases you can use "Mental picture" instead a noun phrase "Brain wave".

Mental picture noun - A clear and telling mental image.

Brain wave and mental picture are semantically related. Sometimes you can use "Brain wave" instead a noun phrase "Mental picture".