Level C of the effectiveness of communication is defined as

Level C of the effectiveness of communication is defined as psychological noise.

Psychological noise is internal interference such as preconceptions, emotions or bias that distorts how a message is received.

Channel noise is disturbance within the medium itself, a technical rather than mental barrier.

Semantic noise arises from differences in meaning and language, not from the receiver's inner state.

Source noise would sit with the sender, whereas this level names interference within the mind receiving the message.

Mental filters and mindset make psychological noise a decisive limit on effective communication.