Final answer:
Social Pragmatic Communication Disorder (SPCD) is similar to Autism Spectrum Disorder without the related behavioral symptoms. Asperger's Disorder also has related similarities but with typical language development. Pervasive Developmental Disorder is an outdated term that previously described various disorders on the autism spectrum.
Step-by-step explanation:
Understanding Disorders Similar to Autism Spectrum Disorder
Autism Spectrum Disorders (ASD) present a complex range of neurodevelopmental challenges, including nuances in social interaction, communication deficiencies, and repetitive behaviors. However, disorders that may resemble ASD without the full spectrum of behavioral symptoms exist. Social Pragmatic Communication Disorder (SPCD) is one such condition that is focused primarily on the pragmatic aspects of communication, like understanding context and the flow of conversation. SPCD is characterized by significant challenges with the social aspects of verbal and nonverbal communication, but unlike ASD, SPCD does not include repetitive behaviors and restricted interests. On the other hand, Asperger's Disorder, previously considered part of ASD, involves persistent difficulties in social interaction along with restricted, repetitive patterns of behavior or interests but typical language development. Pervasive Developmental Disorder (PDD) is a broader term previously used to describe a variety of disorders similar to ASD, including Asperger's, but it is no longer a diagnosis according to the latest DSM-5.