Sensory processing disorder

Sensory processing disorder (SPD; also known as sensory integration dysfunction) is a condition that exists when multisensory integration is not adequately processed in order to provide appropriate responses to the demands of the environment.

The senses provide information from various modalities — vision, audition, tactile, olfactory, taste, proprioception, and vestibular system — that humans need to function. Sensory processing disorder is characterized by significant problems to organize sensation coming from the body and the environment and manifested by difficulties in the performance in one or more of the main areas of life: productivity, leisure and play or activities of daily living. Different people experience a wide range of difficulties when processing input coming from a variety of senses, particularly tactile (e.g. finding fabrics itchy and hard to wear while others do not), vestibular (e.g. experiencing motion sickness while riding a car) and proprioceptive (having difficulty grading the force to hold a pen in order to write).