What is a possible effect of applying excessive high frequencies during EEG enhancement?

Applying excessive high frequencies during EEG enhancement can lead to a range of consequences, making the choice that encompasses all potential effects the most appropriate one. When high frequencies are amplified beyond the necessary range, it can result in the introduction of artifacts into the EEG signal, which can obscure the underlying brain activity being recorded. Artifacts may arise from various sources, including electrical interference or muscle activity, and they can significantly complicate the interpretation of the data.

Additionally, while slow brain waves are the focus of enhancement during EEG analysis, excessive high frequencies can actually hinder the visibility of these slower waves rather than enhance them. This interference can lead to a reduction in signal clarity, making it difficult to distinguish meaningful signals from noise.

Thus, when high frequencies are applied excessively, the combined effects of introducing artifacts, reducing the clarity of both fast and slow brain waves, and failing to enhance the desired signals lead to the conclusion that all of these effects are possible outcomes.