Aspect Medical to Report Second Quarter 2005 Results July 27, 2005; Conference Call Scheduled for Same Day

Business Wire, June 23, 2005

NEWTON, Mass. -- Aspect Medical Systems, Inc. (Nasdaq: ASPM) will report earnings results for the 2005 second quarter on Wednesday, July 27, 2005. Following the earnings announcement on Wednesday morning, the Company will host a conference call and live webcast at 10:00 a.m. Eastern Daylight Time for all interested parties, including financial analysts, portfolio managers, individual investors and members of the press. To participate in the call, please dial 1-800-289-0743 (domestic), 1-913-981-5546 (international), or access the webcast at www.aspectmedical.com on the Investor page, or at www.earnings.com. Telephone replays will be available by dialing 1-888-203-1112 (domestic), or 1-719-457-0820 (international), access code 6634477. The webcast replay will be available from July 27, 2005 until August 4, 2005.

About Aspect Medical Systems, Inc.

Aspect Medical Systems, Inc. (Nasdaq: ASPM) is a global market leader in brain monitoring technology. Aspect's BIS technology directly measures the effects of anesthetics and sedatives on the brain. To date, BIS technology has been used to assess more than 11.3 million patients and has been the subject of approximately 1,800 published articles and abstracts. BIS technology is installed in approximately 38 percent of all domestic operating rooms and is available in more than 160 countries. Aspect has OEM agreements with seven leading manufacturers of patient monitoring systems. The Company is also investigating how other methods of analyzing brain waves may aid in the diagnosis and management of neurological diseases, including depression and Alzheimer's disease.

For more information, visit Aspect's Web site at www.aspectmedical.com