The cocktail party effect describes the ability to focus one's listening attention on a single talker among a mixture of conversations and background noises, ignoring other conversations. [1] This effect reveals one of the surprising abilities of our auditory system, which enables us to talk in a noisy place. The auditory system is the Sensory system for the sense of hearing.
The cocktail party phenomenon can occur both when we are paying attention to one of the sounds around us and when it is invoked by a stimulus which grabs our attention suddenly. Attention is the Cognitive process of selectively concentrating on one aspect of the environment while ignoring other things Stimulation is the action of various agents ( stimuli) on Muscles Nerves or a sensory end organ by which activity is evoked especially the nervous [2] For example, when we are talking with our friend in a crowded party, we still can listen and understand what our friend says even if the place is very noisy, and can simultaneously ignore what another nearby person is saying. Then if someone over the other side of the party room calls out our name suddenly, we also notice that sound and respond to it immediately. The hearing reaches a noise suppression from 9 to 15 dB, i. e. , the acoustic source, on which humans concentrate, seems to be three times louder than the ambient noise. A microphone recording in comparison will show the big difference.
The effect is an auditory version of the figure-ground phenomenon. In Visual perception, figure-ground is a type of Perceptual organization in vision that involves assignment of edges to regions for purposes of shape determination Here, the figure is the sound one pays attention to, while the ground is any other sound ("the cocktail party").
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Experiments and theoretical approaches
The effect was first described (and named) by Cherry in 1953. [3] Much of the early work in this area can be traced to problems faced by air traffic controllers in the early 1950's. Air traffic control ( ATC) is a service provided by ground-based controllers who direct Aircraft on the ground and in the air [1] At that time, controllers received messages from pilots over loudspeakers in the control tower. Hearing the intermixed voices of many pilots over a single loudspeaker made the controller's task very difficult.
Cherry (1953)[3] conducted perception experiments in which subjects were asked to listen to two different messages from a single loudspeaker at the same time and try to separate them. In Psychology and the Cognitive sciences perception is the process of attaining awareness or understanding of sensory Information. His work reveals that our ability to separate sounds from background noise is based on the characteristics of the sounds, such as the gender of the speaker, the direction from which the sound is coming, the pitch, or the speaking speed. Gender comprises a range of differences between men and women extending from the biological to the social Pitch represents the perceived Fundamental frequency of a sound
In the 1950's, Broadbent[4] conducted dichotic listening experiments: subjects were asked to hear and separate different speech signals presented to each ear simultaneously (using headphones). In Cognitive psychology, dichotic listening is a procedure commonly used to investigate Selective attention in the Auditory system. From the results of his experiment, he suggested that "our mind can be conceived as a radio receiving many channels at once": the brain separates incoming sound into channels based on physical characteristics (e. g. perceived location), and submits only certain subsignals for semantic analysis (deciphering meaning). In other words, there exists a type of audio filter in our brain that selects which channel we should pay attention to from the many kinds of sounds perceived. An audio filter is a type of filter used for processing Sound signals. This is called Broadbent's filter theory. [5] There is some empirical evidence to support this theory, though it has been criticized by some (Norman, et al).
There are other theories, including those of Treisman (1960), and Deutsch and Deutsch (1963). Anne Treisman FRS (born September 2, 1935 in Wakefield, Yorkshire) is a Psychologist, working currently at Princeton
This phenomenon is still very much a subject of research, in humans as well as in computer implementations (where it is typically referred to as source separation or blind source separation). Source separation problems in Digital signal processing are those in which several signals have been mixed together and the objective is to find out what the original Blind signal separation, also known as blind source separation, is the separation of a set of signals from a set of mixed signals without the aid of information The neural mechanism in human brains is not yet fully clear.
References
- ^ a b Arons, Barry (1992). A Review of the Cocktail Party Effect (pdf). MIT Media Lab. Retrieved on 2006-12-18. Year 2006 ( MMVI) was a Common year starting on Sunday of the Gregorian calendar. Events 218 BC - Second Punic War: Battle of the Trebia - Hannibal 's Carthaginian forces defeat those of the
- ^ Moray, N. (1959) Attention in dichotic listening: Affective cues and the influence of instructions Quarterly Journal of Experimental Psychology.
- ^ a b Cherry, E. C. (1953) Some experiments on the recognition of speech, with one and with two ears. Journal of Acoustical Society of America 25(5), 975--979.
- ^ Broadbent, D. E. (1954). The role of auditory localization in attention and memory span. Journal of Experimental Psychology, 47, 191-196.
- ^ Broadbent, D. E. (1958). Perception and communication. New York:Pergamon.
See also
External links
- Handbook for acoustic ecology
- What is attention? Theory of selective attention
- Dichotic Listening Experiment
- Early and Late Selection Theories of Attention by Nick Milton (May 1994)
Dictionary
cocktail party effect
-noun
- the ability (or the difficulty) of focusing one's attention on a single auditory source in a jumble of noises