Mental activities that differ noticeably from normal waking consciousness are known as __________

A) hyperconsciousness.
B) unconscious states.
C) relaxed wakefulness.
D) altered states of consciousness.

Altered States

Conditions of consciousness that differ significantly from one's normal waking state, induced by factors like meditation, drug use, or sleep.

Consciousness

The state of being aware of and able to think about one's own existence, sensations, thoughts, surroundings, etc.