Bio-logic Systems Corp. Announces Stockholder Approval of Merger.

MUNDELEIN, Ill. -- Bio-logic Systems Corp. (NASDAQ:BLSC) announced that at a special meeting held today its stockholders approved and adopted the Agreement and Plan of Merger, dated as of October 16, 2005, by and among Natus Medical Incorporated, Summer Acquisition Corporation, a wholly-owned subsidiary of Natus, and Bio-logic and approved the merger of Summer Acquisition Corporation with and into Bio-logic, with Bio-logic continuing as a wholly-owned subsidiary of Natus. The merger is expected to close prior to the open of trading on The NASDAQ Stock Market on January 5, 2006. Under the terms, and subject to the conditions, of the merger agreement, Natus will pay $8.77 in cash for each outstanding share of Bio-logic common stock.

Cautionary Note Regarding Forward-Looking Statements 

This press release contains forward-looking statements that are based on the beliefs of the management of Bio-logic, as well as assumptions made by, and information currently available to, Bio-logic's management. The forward-looking statements are subject to certain risks, uncertainties and other factors that could cause actual results to differ materially from those expressed in or implied by the forward looking statements, including the risk that Bio-logic's merger with Natus will not be consummated on a timely basis or at all and other risks related to the pendency of the merger. Except as expressly required by the federal securities laws, Bio-logic undertakes no obligation to update or revise these forward-looking statements or forecasts to reflect new events or changed circumstances or for any other reason.