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1.Short term memory..when students have less time to recall the long utterances, they can't understand or probably find difficult to understand what they heard and what they're hearing.They also are not able to connect the information.
2. Mental map: understanding vocabulary and grammar. When you are listening, you miss something or miss few words.When you are listening to your native language or proficient language, you may have no problem to think carefully, you think it naturally. It is called autonomous listening.
3. Cultural expectations: this is main barrier. Audience has some different cultural background.students get nervous about such certain context and hesitate to listen and get into the context. Perhaps they don't understand or they can't connect it.

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Autonomous listening is an ability to listen english as native language or proficient language. Students should be able to listen english naturally. They should connect with cultural expectations. They don't face any obstacles while listening english. It's an automatic process. They should develop their memory as well.