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BINAURAL ADVANTAGES

localization,threshold advantage, speech in noise, reverbration,binaural fusion, masking level difference

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localization of pure tones

Interaural time difference in low frequencies, interaural intensity difference in high frequencies,

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Interaural time difference in low frequencies

a sound coming from the midle there will be no ITD btwn ears. Shadowed ear is the ear that recieves the sound later. processed on the medial superior olive

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Interaural intesity difference in high frequencies

one ear hears sound louer than the other. shadowed ear recieves sound later and lower amplitude. low frequencies hav longer waveforms results in no shadow effect. processed in the lateral superior olive.

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localization of complex tones

timing cues(As with pure tones). pinna effect

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PINNA EFFECT

pinna reflects high frequencies with echoes whose latency varies with direction and also interfers with other eechoes/sounds that gives localization cues to be processed by the DCN dorsal cochlear nucleus.

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Threshold Advantage of Binaural summation

when you have an advantage of 3dB or double the power binaural thresholds are better because you ur close to zero which is good. also it allows you to hear in a loud room.

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Speech in Noise

studies shown improved intesity and frequency discrimination which might improve speech in noise abilities. if brain is permitted to sample input fm both ears it can suppress unwated siganl. it can result in a S/N (siganl/noise ration) of 2-3db

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Reverberation & Precedence Effect

first waves arriving at the ear dominateadv in a revebrant envi were signal dominates & not the reverberation of that signa aka precedence effect where echoes& rever r minimized 4 short period after orig sound firstsignalenter ear is proc da rest ignore

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BINAURAL FUSION

cognitive process were auditory info is presented to both ears or to each ear. its an imp part of speech bc one ear may pick more info abt the stimuli than the other. ea ear send signal recive up the CANS wereit combined as1 aud signal @ levelof brainstem

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EXAMPLE OF BINAURAL FUSION

When we hear with two ears we only have one auditory immage (one gestalt). a speaker in front if sitting in the middle on hears one sound in the middle.

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BINAURAL MASKING LEVEL DIFFERENCE (BMLD)

the masked threshold of asignal can sometimes be lowered when listening with two ears rather than one.aka cocktail party effect ability to focus ones listenign attention on a sngle talkeer among mic of convo n background noise,igoring other convo

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MASKING LEVEL DIFFERENCES

not GOOD- noise tone presented in both ears.ok- noise and tone presented but tone is out of phasenot GOOD- tone and noise presented to one ear (left) but barely audible)ok- tone and noise on left ear but then presented with a tone on the other side

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Created by: GHAIDEE