dichotic
adjective
dich·otic (ˌ)dī-ˈkō-tik 
: relating to or involving the presentation of a stimulus to one ear that differs in some respect (such as pitch, loudness, frequency, or energy) from a stimulus presented to the other ear
dichotic listening
dichotically
(ˌ)dī-ˈkō-ti-k(ə-)lē
adverb 
Word History
Etymology
borrowed from German dichotisch, from dich- dich- + -otisch -otic entry 2
Note: Term introduced by the German psychologist Carl Stumpf (1848-1936) in "Differenztöne und Konsonanz," Zeitschrift für Psychologie und Physiologie der Sinnesorgane, Band 39 (1905), p. 276. Stumpf attributes the coinage (along with that of diotisch "diotic" and monotisch "monotic") to his colleague H. Diels.
First Known Use
circa 1911, in the meaning defined above
Medical Definition
dichotic
adjective
dich·otic (ˈ)dī-ˈkōt-ik
: relating to or involving the presentation of a stimulus to one ear that differs in some respect (as pitch, loudness, frequency, or energy) from a stimulus presented to the other ear
dichotic listening