The present disclosure relates to peripheral sensory stimulation and synchronized deep breathing systems, devices, and methods used in the treatment of various neurological disorders. A peripheral sensory stimulation system of the present disclosure may include a control module, a power source configured to provide electrical power to the control module, and a stimulation delivery unit coupled to the control module via tubing. The stimulation delivery unit can be configured to receive a human appendage to provide stimulation therapy for the treatment of a neurological disorder. The stimulation delivery unit can provide stimulation therapy to a user by directing air out of a plurality of apertures and onto the human appendage, the pattern of delivered air being controlled by the control module. A decrease in symptoms associated with various neurological disorders including anxiety, depression, traumatic brain injury, PTSD, and insomnia is reported, along with increasing user relaxation and satisfaction during treatment.

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