Final answer:
Shaquan is using a non-listening roadblock in communication, where he is not giving full attention to his mother's words while being engaged in other activities.
Step-by-step explanation:
The communication roadblock Shaquan is using is non-listening. This occurs when someone fails to give their full attention to the speaker, which is indicated by Shaquan's actions of continuing to work on the computer and turning up the radio while his mother is trying to discuss the calendar with him. This type of behavior interferes with effective communication as it prevents Shaquan from fully receiving and processing the information his mother is trying to convey.