Ananthanarayan Ravi Krishnan, Ph.D
B.Sc., 1973 The University of Mysore, INDIA
M.A., 1980 Memphis State University, Memphis, TN
Ph.D., 1983 The University of Texas, Dallas, TX
1983-1984: Post-graduate Researcher, Dept. of Neurology, The University of California, Irvine, CA
1984-1987: Director, Evoked Potential Laboratory, Chicago, IL
1987-1989: Assistant Professor, Audiology, University of Pittsburgh, PA
1990-1998: Assistant/Associate Professor, Audiology, University of Tennessee, Knoxville, TN
1998-Present: Associate Professor, Audiology/Hearing Science, Purdue University, W.Lafayette, IN
American Speech Language Hearing Association
Association for Research in Otolaryngology
American Academy of Audiology
Ananthanarayan AK., Xu Y., Gandour J (2004). Human frequency following responses: representation of pitch contours of Chinese tones. Hear Res. 189:1-12.
Ananthanarayan A.K., Pandya P.P (2004, In Press). Evaluation of the human frequency following response
2f1-f2 distortion product. J. Am. Acad. Audiol.
Wilson J., Ananthanarayan A.K. (2004). Human frequency following responses to binaural masking level difference stimuli (in review, J. Am. Acad. Audiol.).
Katbamna B., Brown JA., Ide CF; Ananthanarayan A.K. (2004). Auditory brainstem response thresholds and characteristics measured in response to sound pressure stimulation in the aquatic frog Xenopus Laevis. In review, JARO.
Ananthanarayan A.K. (2002). Human frequency following response: representation of steady-state vowels. Hear. Res. 166:192-201.
Lucas J.R., Freeberg, T.M., Ananthanarayan A.K (2002). A comparative study of avian auditory brainstem responses: correlations with phylogeny and vocal complexity, and seasonal effects. J. Comp. Physiol. 188: 981-992.
Plyler , P., Ananthanarayan AK (2001). Human frequency following responses: representation of second formant transitions in normal and hearing-impaired listeners. J. Am. Acad. Audiol., 12:523-533.
Ananthanarayan A.K., Parkinson J. (2000). Human frequency following response: representation of tonal sweeps. J. Audiol. Neurootol.,5(6):312-321.
Ananthanarayan A.K. (1999). Human frequency following responses to two-tone approximations of steady- State vowels. J. Audiol.Neurootol., 4:95-103.
Ananthanarayan A.K. (1998). Binaural interaction in the human frequency following response: effects of interaural intensity difference. J Audiol.Neurootol, 3:291-299.
Ananthanarayan A.K., Durrant J.J (1994). Comparison of transducer radiation in a deaf subject and a resistor-network simulator. British J. Audiol. 28, 149-154.
Ananthanarayan A.K., Durrant J.J. (1992). The frequency following response and the onset Response: evaluation of frequency specificity using a forward-masking paradigm. Ear Hear. , 13(4):228-232.
Moore E.J., Semela J.J.M., Ananthanarayan A.K. (1992). The I' potential of the brain-stem auditory evoked potential. Scand. Audiol.,21:153-156.
Ananthanarayan A.K., Durrant J.J. (1991). On the origin of wave II of the Auditory Brainstem Responses. Ear Hear., 12(3):174-179.
Ananthanarayan A.K., Gerken G.M. (1987). Response enhancement and reduction of the ABR in a forward-masking paradigm. Electroencephal Clin Neurophysiol., 66:427-439.
Ananthanarayan A.K., Gerken G.M. (1983). Post-stimulatory effects on the ABR: partial masking and enhancement. Electroencephal Clin Neurophysiol., 55(2):223-226.
Ananthanarayan A.K., Moore E.J. (1983). Effects of ipsilateral and contralateral masking on the auditory brainstem responses. In, Moore EJ (ED), Bases of ABR, Grune and Stratton, New York.
Goals of Currently Active Research:
1. Evaluation of encoding of pitch relevant information in Chinese tones. The goal is determine if language relevant information is contained in FFR for listeners with native tonal language (Chinese) versus non-tonal language listeners (English).
2. Evaluation of the electrophysiological correlate of upward spread of masking using the surface recorded human frequency following response (FFR). The goal is to characterize the FFR correlate of upward-spread of masking in normal and hearing-impaired individuals using two-tone approximations of vowels.
3. Evaluation of FFR to tonal sweep trajectories in children with normal language and children with specific language impairment (SLI). The goal is to determine if aspects of temporal processing is disrupted in children with SLI.
4. Evaluation of the FFR correlates of cochlear non-linearity (2f1-f2). The goal is to compare DPOAE and FFR-DP to determine if these responses share response characteristics as expected.
Goals of Research During the Past three years:
1. Determine if the human FFR can encode steady-state speech-like sounds.
2. Determine if the human FFR can encode time variant frequency presented in tonal sweeps.
3. Determine if nonlinear phenomena like two-tone suppression can be evaluated using the FFR.