We are not sure. Human communication relies on taking in complicated perceptual information from the outside world through the senses, such as hearing, and interpreting that information in a meaningful way. Human communication also requires certain mental abilities, such as attention and memory. Scientists still do not understand exactly how all of these processes work and interact or how they malfunction in cases of communication disorders. Even though your child seems to “hear normally,” he or she may have difﬁculty using those sounds for speech and language comprehension.
The cause of APD is often unknown. In children, auditory processing difﬁculty may be associated with conditions such as dyslexia, attention deﬁcit disorder, autism, autism spectrum disorder, speciﬁc language impairment, pervasive developmental disorder, or developmental delay. Sometimes this term has been misapplied to children who have no hearing or language disorder but have challenges in learning.