Ultimately, in comparison to the binaural condition, “peripheral masking is avoided when speech is heard dichotically.” This demonstration was originally known as “the Rand effect” but was later renamed “dichotic release from masking”. F2 and F3 varied in low and high intensity. In his study, the first stimuli: formant (F1), was presented to one ear while the second and third stimuli:(F2) and (F3) formants, were presented to the opposite ear. He interpreted this result as indicating right-hemisphere dominance for pitch discrimination.ĭuring the early 1970s, Tim Rand demonstrated dichotic perception at Haskins Laboratories. In another example, Sidtis (1981) found that healthy adults have a left-ear advantage on a dichotic pitch recognition experiment. A dichotic listening performance advantage for one ear is interpreted as indicating a processing advantage in the contralateral hemisphere. In the late 1960s and early 1970s Donald Shankweiler and Michael Studdert-Kennedy of Haskins Laboratories used a dichotic listening technique (presenting different nonsense syllables) to demonstrate the dissociation of phonetic (speech) and auditory (nonspeech) perception by finding that phonetic structure devoid of meaning is an integral part of language and is typically processed in the left cerebral hemisphere. Later, they are asked about the content of either the message they were asked to attend to or the message that they were not told to listen to. Participants are asked to pay attention to one or both of the stimuli. The different stimuli are directed into different ears over headphones. Specifically, it is “used as a behavioral test for hemispheric lateralization of speech sound perception.”:381 During a standard dichotic listening test, a participant is presented with two different auditory stimuli simultaneously (usually speech). Dichotic Listening is a psychological test commonly used to investigate selective attention within the auditory system and is a subtopic of cognitive psychology and neuroscience.
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