Which one of the following is excluded from the list of communication barriers?

The philosophical is not a recognised type of communication barrier, so it is the one excluded from the list.

Physical barriers arise from noise, distance, faulty channels, poor lighting and similar external interference.

Semantic barriers come from words being understood differently, from jargon and from meaning going astray.

Psychological barriers grow from emotions, attitudes, stereotyping and the sender's or receiver's frame of mind.

These three are standard categories that block or distort the message.

No established scheme lists a separate philosophical barrier alongside them.