Projections in ipsilateral hemisphere are weaker and send information
more slower than projections to the contralateral hemisphere.
The RH will preferentially attend to input from the right ear.
Dichotic listening takes advantage of the suppression of the ipsilateral
projections that takes place when stimuli compete with each other .
Presenting stimuli to each ear .
Dichotic listening tasks that use words or phenomenon as stimuli tend
to result in as asymmetry score that favors the right ear.
Most people language functions and for them the LH is better able to
comprehend ad report words or phonemes stimuli . However some
people with RH language functions exhibit asymmetries that favor the
left ear .
Dichotic listening reports more people with RH language functions
than the IAT or spilt brain studies.
Some critics say is am artifact of testing conditions.
Dichotic listening requires the perception of sounds
It is suggested that most dichotic tasks are not pure measures of
laterality and that over representation of RH language reflects the
impurities I the task.
Dichotic listening that use music or environmental sounds , or
emotional tones as stimuli tend to result in an asymmetry score that
favors the left ear.
These results suggest that the RH is specialized for the processing of
non linguistic sounds , such as music and prosody .
Take advantage of the segregation in the visual system .
Involves the rapid presentation of stimuli to either the RVF or the LVF
using a tachistoscope ( a specialized piece of equipment that allows the
rapid presentation of stimuli to eitheeer the RVF or LVF) or computer
Participants are asked to report what they observed.
Takes that use words or letters as stimuli tend to result in an
asymmetry score that favors the LH . More correct responses
presented in the RVF.
Most people exhibit LH language functions
However , some people exhibit asymmetries that favor the LVF ,
presumably reflecting RH language function.