Steven A. Hackley
Associate Professor
108 Psychology Building
Lab Information
108 Psychology Building
About the Lab

Research at my lab deals with the neural basis of attention, awareness, and action. Event-related potentials (ERPs), startle-blink, and neuroimaging techniques are used to identify the locus and time course of relevant brain processes in normal and neurologically impaired adults.

Research Interests

Research at Dr. Hackley’s lab is concerned with the neural basis of attention and action in neurologically normal adults and in people with Parkinson’s disease. Methodology includes surface electrophysiology (ERPs, ERDs, EMGs, polysomnograms), brainstem reflexes (startle blink, postauricular reflex), neuroimaging (fMRI, NIRS), and behavioral measures (choice RT, PRP, psychophysics). Topics currently under investigation include reward anticipation, warning effects, deep brain stimulation, evolution of reflex modulation, visual memory and motor memory.


Dr. Hackley earned his Ph.D. at the University of Wisconsin, Madison in 1985 and then pursued postdoctoral studies at the University of California, San Diego prior to joining the faculty at M.U. in 1988. He has held visiting professorships at the University of La Coruña (Spain) and Tuebingen University (Germany). His research has been funded by grants from the National Institutes of Health and the National Science Foundation. Honors include membership on the Board of Scientific Advisors for the Max Planck Institute of Human Cognitive and Brain Sciences, election as president of the Society for Psychophysiological Research, receipt of the Early Career Award for Distinguished Contribution to Psychophysiology, and service as associate editor of the journal, Psychophysiology.

Selected Publications

Hackley, S.A., Langner, R., Rolke, B., Erb, M., Grodd, W., & Ulrich, R. (2009). Separation of phasic arousal and temporal orienting effects in a speeded reaction time task via fMRI. Psychophysiology. 46, 163-171.

Hackley, S.A., Schankin, A., Wohlschlaeger, A., & Wascher, E. (2007). Localization of temporal preparation effects via trisected reaction time. Psychophysiology, 44, 334-338.

Mattox, S., Valle-Inclán, F. & Hackley, S.A. (2006). Psychophysiological evidence for impaired reward anticipation in Parkinson’s disease. Clinical Neurophysiology, 117, 2144-2153.

Sonnenberg, D., Johnson, L.N., Jurkowski, A., & Hackley, S.A. (2006). Facilitation as well as inhibition of the blink reflex by a visual prepulse requires intact striate cortex. Clinical Neurophysiology, 117, 2284-2291.

Jurkowski, Anita J., Stepp, Elizabeth, & Hackley, Steven A. (2005) Variable foreperiod deficits in Parkinson’s disease: Dissociation across reflexive and voluntary reactions, Brain and Cognition, 58, 49-61.

Hackley, S.A., & Valle-Inclán (1998). Automatic alerting does not speed late motoric processes in a reaction-time task. Nature, 391, 786-788.

Miller, J., & Hackley, S.A. (1992). Electrophysiological evidence for temporal overlap among contingent mental processes. Journal of Experimental Psychology: General, 121, 195-209.