Breathing Regulation Training for Individuals With Panic Disorder

Inclusion Criteria for Participants With PD:

* Diagnosis of PD
* History of panic attacks that are at least moderately severe in frequency and severity
* Able and willing to comply with all study requirements

Exclusion Criteria for All Participants:

* History of chest pain, heart attack, congestive heart failure, or clinically significant irregular heartbeat
* History of blood circulation problems or cerebrovascular accidents
* Diabetes mellitus
* Asthma or chronic obstructive pulmonary disease (COPD)
* History of schizophrenia, bipolar disorder, or dementia
* Drugs which would affect breathing
* Alcohol or other substance abuse within 1 year prior to study entry
* Current use of any recreational drugs or consumption of more than 15 alcoholic drinks per week

Exclusion Criteria for Participants Without PD:

* History of anxiety disorders