1. Signal Processing: This is the most basic level, where your brain receives and processes the sound waves of the speaker's voice.
2. Literal: This level involves understanding the words and their literal meaning. You decode the language and grasp the speaker's message.
3. Interpretive: This is the highest level of listening, where you go beyond the literal meaning and try to understand the speaker's intent, feelings, and underlying message. You consider the context, body language, and tone of voice to make sense of the communication.
So, the missing level is Interpretive.