Perceptual Systems Faculty
Duane Albrecht (Emeritus)
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DENNIS MCFADDEN
Ashbel Smith Professor
The goal of our research is to better understand how the auditory system works. In the past, we have studied a number of basic topics including the localization of sound sources in space, simultaneous and temporal masking of one sound by another, frequency and temporal resolution, loudness perception, acoustic emissions given off by the inner ear, the effects and aftereffects of intense sound on auditory perception of various sorts, the effects of common drugs on the auditory system, and the interactions of drugs and noise exposure. In recent times, we have been concerned with the processing underlying certain complex waveforms that have characteristics similar to those of speech and music, and we have been studying various effects that appear to be related to neural adaptation in the auditory system. Other recent experiments have addressed the issue of the heritability of certain characteristics of the auditory system. Whenever possible, we attempt to explain our results in terms of facts established by neurophysiologists working on the auditory systems of lower animals using similar acoustic stimulation. In a typical experiment, crews of 6-8 subjects are tested simultaneously for two hours a day, five days a week for several weeks. Signal presentation, trial timing, and response collection are accomplished by a Macintosh Quadra 950 computer equipped with a digital-signal-processing board and running LabVIEW software. The lab contains all of the standard instrumentation used for generating and measuring acoustic stimuli along with several PowerMac, Quadra, and Mac II computers for use in data analysis, graphics, and word processing.
Courses
Psychology 323S - Sex Differences in Cognition and Perception
Psychology 394U - Psychoacoustics
Selected Publications
McFadden, D. Masculinization of the mammalian cochlea. Hearing Research, 2009, in press.
McFadden, D., Pasanen, E., Valero, M.D., Roberts, E.K., and Lee, T.M. Effect of prenatal androgens on click-evoked otoacoustic emissions in male and female sheep (Ovis aries). Hormones and Behavior, 2008, in press.
Valero, M.D., Pasanen, E.G., McFadden, D., Ratnam, R. Distortion product otoacoustic emissions in the common marmoset (Callithrix jacchus): Parameter optimization. Hearing Research, 2008, 243, 57-68.
McFadden, D. What do sex, twins, spotted hyenas, ADHD, and sexual orientation have in common? Perspectives in Psychological Science, 2008, 3, 309-323.
McFadden, D., Pasanen, E.G., Weldele, M.L., Glickman, S.E., and Place, N.J. Masculinized otoacoustic emissions in female spotted hyenas (Crocuta crocuta). Hormones and Behavior, 2006, 50, 285-292.
McFadden, D. Pasanen, E.G., Raper, J., Lange, H.S., and Wallen, K. Sex differences in otoacoustic emissions measured in rhesus monkeys (Macaca mulatta). Hormones and Behavior, 2006, 50, 274-284.
McFadden, D., Westhafer, J.G., Pasanen, E.G., Carlson, C.L., and Tucker, D.M. Physiological evidence of hypermasculinization in boys with the inattentive subtype of attention-deficit/hyperactivity disorder (ADHD). Clinical Neuroscience Research, 2005, 5, 233-245.
McFadden, D., Loehlin, J.C., Breedlove, S.M., Lippa, R.A., Manning, J.T. and Rahman, Q. A reanalysis of five studies on sexual orientation and the relative length of the 2nd and 4th fingers (the 2D:4D ratio). Archives of Sexual Behavior, 2005, 34, 341-356.
McFadden, D. and Bracht, M.S. (2005) Sex differences in the relative lengths of metacarpals and metatarsals in gorillas and chimpanzees. Hormones and Behavior, 47, 99-111.
Pasanen, E.G., and McFadden, D. (2004) Collecting data from afar over the Internet. Echoes, 14, 8.
Loehlin, J.C. and McFadden, D. (2003) Otoacoustic emissions, auditory evoked potentials, and traits related to sex and sexual orientation. Archives of Sexual Behavior, 32, 115-127.
McFadden, D. and Shubel, E. (2003) The relationships between otoacoustic emissions and relative lengths of fingers and toes in humans. Hormones and Behavior, 43, 421-429.
McFadden, D., and Bracht, M.S. (2003) The relative lengths and weights of metacarpals and metatarsals in baboons (Papio hamadryas). Hormones and Behavior, 43, 347-355.
McFadden, D. and Shubel, E. (2002) Relative lengths of fingers and toes in human males and females. Hormones and Behavior, 42, 492-500.
McFadden, D. (2002) Masculinization effects in the auditory system. Archives of Sexual Behavior, 31, 93-105.
McFadden, D. (2001) Otoacoustic emissions as a window onto prenatal development and sexual differentiation. Seminars in Hearing, 22, 347-360.
Harkrider, A.W., Champlin, C.A., and McFadden, D. (2001) Acute effect of nicotine on nonsmokers: In. OAEs and ABRs. Hearing Research, 160, 73-88.
Pasanen, E.G. and McFadden, D. (2000) An automated procedure for identifying spontaneous otoacoustic emissions. J. Acoust. Soc. Am., 108, 1105-1116.
McFadden, D. and Champlin, C.A. (2000) Comparison of auditory evoked potentials in heterosexual, homosexual, and bisexual males and females. Journal of the Association for Research in Otolaryngology, 1, 89-99.
McFadden, D. (2000) Masculinizing effects on otoacoustic emissions and auditory evoked potentials in women using oral contraceptives. Hearing Research, 142, 23-33.
McFadden, D. and Pasanen, E.G. (1999) Spontaneous otoacoustic emissions in heterosexuals, homosexuals, and bisexuals. J. Acoust. Soc. Am., 105, 2403-2413.
McFadden, D. and Callaway, N.L. (1999) Better discrimination of small changes in commonly encountered than in less commonly encountered stimuli. Journal of Experimental Psychology: Human Perception and Performance, 25, 543-560.
McFadden, D., Pasanen, E.G., and Callaway, N.L. (1998) Changes in otoacoustic emissions in a transsexual male during treatment with estrogen. J. Acoust. Soc. Am, 104, 1555-1558.
McFadden, D. and Loehlin, J.C. (1995) On the heritability of spontaneous otoacoustic emissions: A twins study. Hearing Research, 85, 181-198.
McFadden, D., Loehlin, J.C. and Pasanen, E.G. (1996) Additional findings on heritability and prenatal masculinization of cochlear mechanisms: Click-evoked otoacoustic emissions. Hearing Research, 97, 102-119.
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