What technique can elicit lambda waves?

Lambda waves are specific waveforms observed in an EEG, and they are typically associated with visual processing, particularly when a subject is engaged in tasks that require scanning or analyzing complex visual stimuli. This is consistent with the activity of neurons in the visual cortex.

When a person is scanning a complex image, the brain becomes actively involved in interpreting the visual data, which can lead to the generation of lambda waves. These waves are usually more prominent when there is attention directed towards visual input, which aligns with scanning activities.

Listening to music, dreaming, and relaxation exercises may produce different types of brain wave patterns, but they are not specifically known to elicit lambda waves. This distinction outlines why engaging with complex visual stimuli through scanning or similar activities is the best answer for the production of lambda waves.