What is Sensory Processing Disorder?
Sensory processing disorder or SPD is a Neurological disorder causing difficulties with taking in, processing and responding to sensory information about the environment and from within the own body (visual, auditory, tactile, olfaction, gustatory, vestibular and proprioception).
For those with SPD, sensory information may be sensed and perceived in a way that is different from most other people. Unlike blindness or deafness, sensory information can be received by people with SPD, the difference is that information is often registered, interpreted and processed differently by the brain. The result can be unusual ways of responding or behaving, finding things harder to do. Difficulties may typically present as difficulties planning and organizing, problems with doing the activities of everyday life (self care, work and leisure activities), and for some with extreme sensitivity, sensory input may result in extreme avoidance of activities, agitation, distress, fear or confusion.
The term SPD is now often used (though not without controversy) instead of the earlier term sensory integration dysfunction which was originally used by occupational therapist A. Jean Ayres as part of her theory that deficits in the processing and interpretation of sensation from the body and the environment could lead to sensorimotor and learning problems in children.
There are three types of Sensory Processing Disorder:
Type I - Sensory Modulation Disorder (SMD). Over, or under responding to sensory stimuli or seeking sensory stimulation. This group may include a fearful and/or anxious pattern, negative and/or stubborn behaviors, self-absorbed behaviors that are difficult to engage or creative or actively seeking sensation.
Type II - Sensory Based Motor Disorder (SBMD). Shows motor output that is disorganized as a result of incorrect processing of sensory information affecting postural control challenges and/or dyspraxia.
Type III - Sensory Discrimination Disorder (SDD). Sensory discrimination or incorrect processing of sensory information. Incorrect processing of visual or auditory input, for example, may be seen in inattentiveness, disorganization, and poor school performance.
Research and publications by: Lucy, J. Miller, Ph.D., OTR, Marie Anzalone, Sc.D., OTR, Sharon A. Cermak, Ed.D., OTR/L, Shelly J. ,Lane, Ph.D, OTR, Beth Osten, M.S,m OTR/L, Serena Wieder, Ph.D., Stanley I. Greenspan, M.D.