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Sending voice messages over pairs of channels makes available more channels for communication than would be possible if channels were used in a conventional manner and only one message was sent over one channel. Although this means that all channels under the dual channel system must carry several messages simultaneously, it is shown that for subjects wearing earphones, message intelligibility remains remarkably higher than if the same number of messages are sent over a single channel. The superiority of the dual channel method is attributed primarily to the unique capability of the human ear-brain system to perceive diotic signals as being located in the center of the head while all dichotic signals are perceived as being off to the side of the head. Where seven voices are talking simultaneously intelligibility of messages under the dual channel method of transmission is about 94 percent as compared to 11 percent under the single channel method. Practical implications of these findings for a number of military and civilian communication situations are discussed.

Research reported nearly 20 years ago concluded that the ability to make auditory pitch discriminations is impaired in some Ss by prolonged listening to sonar returns. As a special type of pitch discrimination, discrimination of doppler, is of importance in classifying sonar signals, an experiment was performed to determine whether or not listening to sonar returns for 90 minutes impairs the ability to discriminate doppler. No impairment was found. A second aim of this experiment was to evaluate the effectiveness of an alertness indicator when listening for sonar signals. With the indicator 16 per cent more signals were detected than without it.

Speech announcing Hays' candidacy in the Arkansas gubernatorial race ; -3- rural and urban citizens. I will seek also to add to the contentment of our senior citizens who have earned an easier road in the afternoon of their lives. If this sounds like something for everybody, that is just what I intend, for I believe no segment of the population should be denied a share in the wealth we are capable of creating. But I propose, while seeking the help of wise leaders and listening sympathetically to those who have aspirations for an improved lot in life, to determine decisions, not on the basis of political pressures, but to assume responsibility for final judgments. I will respect the independence of the legislature and will seek the improvement of its procedures. I will pursue a spirit of cooperation with the Federal officials who, even when acting on wrong assumptions, have our best interests at heart. I have had an additional incentive to enter this race. I am confident that with the help of my fellow Democrats we can unite to win in the fall election and give to Arkansas an impressive record based upon the historic principles of the Democratic party.

Born June 8, 1921, in Paris, Texas, Gordon McLendon served as an interpreter in the U.S. Navy during World War II. In 1947, he established KLIF radio in Dallas, Texas. At the same time, he began the Liberty Broadcasting System, an independent affiliation that encompassed over 400 radio stations during its five years of operation. McLendon was a pioneer in recreating sporting events, using the voice of the "Old Scotsman." During the 1950s he developed the top 40 format (rapid fire music, news and contests). McLendon also owned a string of drive-in theaters, produced several motion pictures, and developed advertising campaigns for over 150 movies. In 1964, he campaigned for the Democratic nomination to the U.S. Senate against Ralph Yarborough. Over the course of his career, McLendon owned twenty-four radio stations. He died in 1986. ; The collection includes editorials, political files, political campaign materials, movie promotions, business correspondence, and radio station policy books. Additionally, there are recordings in various formats of interviews, editorials, soundtracks, movie promotions, easy listening music, documentaries, and advertisements. Of special interest are some of McLendon's editorials, including a series critical of Charles DeGaulle. ; The second and largest part of the collection is comprised of various forms of sound recordings. The sound recordings include sixteen and twelve-inch discs of radio programs, jingles, soundtracks, music, and historical recordings.

Born June 8, 1921, in Paris, Texas, Gordon McLendon served as an interpreter in the U.S. Navy during World War II. In 1947, he established KLIF radio in Dallas, Texas. At the same time, he began the Liberty Broadcasting System, an independent affiliation that encompassed over 400 radio stations during its five years of operation. McLendon was a pioneer in recreating sporting events, using the voice of the "Old Scotsman." During the 1950s he developed the top 40 format (rapid fire music, news and contests). McLendon also owned a string of drive-in theaters, produced several motion pictures, and developed advertising campaigns for over 150 movies. In 1964, he campaigned for the Democratic nomination to the U.S. Senate against Ralph Yarborough. Over the course of his career, McLendon owned twenty-four radio stations. He died in 1986. ; The collection includes editorials, political files, political campaign materials, movie promotions, business correspondence, and radio station policy books. Additionally, there are recordings in various formats of interviews, editorials, soundtracks, movie promotions, easy listening music, documentaries, and advertisements. Of special interest are some of McLendon's editorials, including a series critical of Charles DeGaulle. ; The second and largest part of the collection is comprised of various forms of sound recordings. The sound recordings include sixteen and twelve-inch discs of radio programs, jingles, soundtracks, music, and historical recordings.

Born June 8, 1921, in Paris, Texas, Gordon McLendon served as an interpreter in the U.S. Navy during World War II. In 1947, he established KLIF radio in Dallas, Texas. At the same time, he began the Liberty Broadcasting System, an independent affiliation that encompassed over 400 radio stations during its five years of operation. McLendon was a pioneer in recreating sporting events, using the voice of the "Old Scotsman." During the 1950s he developed the top 40 format (rapid fire music, news and contests). McLendon also owned a string of drive-in theaters, produced several motion pictures, and developed advertising campaigns for over 150 movies. In 1964, he campaigned for the Democratic nomination to the U.S. Senate against Ralph Yarborough. Over the course of his career, McLendon owned twenty-four radio stations. He died in 1986. ; The collection includes editorials, political files, political campaign materials, movie promotions, business correspondence, and radio station policy books. Additionally, there are recordings in various formats of interviews, editorials, soundtracks, movie promotions, easy listening music, documentaries, and advertisements. Of special interest are some of McLendon's editorials, including a series critical of Charles DeGaulle. ; The second and largest part of the collection is comprised of various forms of sound recordings. The sound recordings include sixteen and twelve-inch discs of radio programs, jingles, soundtracks, music, and historical recordings.

Born June 8, 1921, in Paris, Texas, Gordon McLendon served as an interpreter in the U.S. Navy during World War II. In 1947, he established KLIF radio in Dallas, Texas. At the same time, he began the Liberty Broadcasting System, an independent affiliation that encompassed over 400 radio stations during its five years of operation. McLendon was a pioneer in recreating sporting events, using the voice of the "Old Scotsman." During the 1950s he developed the top 40 format (rapid fire music, news and contests). McLendon also owned a string of drive-in theaters, produced several motion pictures, and developed advertising campaigns for over 150 movies. In 1964, he campaigned for the Democratic nomination to the U.S. Senate against Ralph Yarborough. Over the course of his career, McLendon owned twenty-four radio stations. He died in 1986. ; The collection includes editorials, political files, political campaign materials, movie promotions, business correspondence, and radio station policy books. Additionally, there are recordings in various formats of interviews, editorials, soundtracks, movie promotions, easy listening music, documentaries, and advertisements. Of special interest are some of McLendon's editorials, including a series critical of Charles DeGaulle. ; The second and largest part of the collection is comprised of various forms of sound recordings. The sound recordings include sixteen and twelve-inch discs of radio programs, jingles, soundtracks, music, and historical recordings.

Born June 8, 1921, in Paris, Texas, Gordon McLendon served as an interpreter in the U.S. Navy during World War II. In 1947, he established KLIF radio in Dallas, Texas. At the same time, he began the Liberty Broadcasting System, an independent affiliation that encompassed over 400 radio stations during its five years of operation. McLendon was a pioneer in recreating sporting events, using the voice of the "Old Scotsman." During the 1950s he developed the top 40 format (rapid fire music, news and contests). McLendon also owned a string of drive-in theaters, produced several motion pictures, and developed advertising campaigns for over 150 movies. In 1964, he campaigned for the Democratic nomination to the U.S. Senate against Ralph Yarborough. Over the course of his career, McLendon owned twenty-four radio stations. He died in 1986. ; The collection includes editorials, political files, political campaign materials, movie promotions, business correspondence, and radio station policy books. Additionally, there are recordings in various formats of interviews, editorials, soundtracks, movie promotions, easy listening music, documentaries, and advertisements. Of special interest are some of McLendon's editorials, including a series critical of Charles DeGaulle. ; The second and largest part of the collection is comprised of various forms of sound recordings. The sound recordings include sixteen and twelve-inch discs of radio programs, jingles, soundtracks, music, and historical recordings.

Born June 8, 1921, in Paris, Texas, Gordon McLendon served as an interpreter in the U.S. Navy during World War II. In 1947, he established KLIF radio in Dallas, Texas. At the same time, he began the Liberty Broadcasting System, an independent affiliation that encompassed over 400 radio stations during its five years of operation. McLendon was a pioneer in recreating sporting events, using the voice of the "Old Scotsman." During the 1950s he developed the top 40 format (rapid fire music, news and contests). McLendon also owned a string of drive-in theaters, produced several motion pictures, and developed advertising campaigns for over 150 movies. In 1964, he campaigned for the Democratic nomination to the U.S. Senate against Ralph Yarborough. Over the course of his career, McLendon owned twenty-four radio stations. He died in 1986. ; The collection includes editorials, political files, political campaign materials, movie promotions, business correspondence, and radio station policy books. Additionally, there are recordings in various formats of interviews, editorials, soundtracks, movie promotions, easy listening music, documentaries, and advertisements. Of special interest are some of McLendon's editorials, including a series critical of Charles DeGaulle. ; The second and largest part of the collection is comprised of various forms of sound recordings. The sound recordings include sixteen and twelve-inch discs of radio programs, jingles, soundtracks, music, and historical recordings.

Born June 8, 1921, in Paris, Texas, Gordon McLendon served as an interpreter in the U.S. Navy during World War II. In 1947, he established KLIF radio in Dallas, Texas. At the same time, he began the Liberty Broadcasting System, an independent affiliation that encompassed over 400 radio stations during its five years of operation. McLendon was a pioneer in recreating sporting events, using the voice of the "Old Scotsman." During the 1950s he developed the top 40 format (rapid fire music, news and contests). McLendon also owned a string of drive-in theaters, produced several motion pictures, and developed advertising campaigns for over 150 movies. In 1964, he campaigned for the Democratic nomination to the U.S. Senate against Ralph Yarborough. Over the course of his career, McLendon owned twenty-four radio stations. He died in 1986. ; The collection includes editorials, political files, political campaign materials, movie promotions, business correspondence, and radio station policy books. Additionally, there are recordings in various formats of interviews, editorials, soundtracks, movie promotions, easy listening music, documentaries, and advertisements. Of special interest are some of McLendon's editorials, including a series critical of Charles DeGaulle. ; The second and largest part of the collection is comprised of various forms of sound recordings. The sound recordings include sixteen and twelve-inch discs of radio programs, jingles, soundtracks, music, and historical recordings.