• Sleep
• Sleepiness
• Sleep Deprivation
• Performance while Sleepy
• Event Related Potentials (ERPs)
• Risk Assessment during Sleepiness

I am interested in how the brain functions and how well people perform while sleepy. My recent research has looked at :

1. the effect of 20 hours of sleep deprivation on several EEG and ERP (P300, CNV, ERN, Pe) indices of brain functioning, attention and performance monitoring and how they relate to behavioural performance
2. risk assessment during sleep deprivation
3. the effect of habituation on an event-related potential component (P300) thought to be reflective of attention

My current research involves the behavioural, EEG and ERP correlates of risky behaviour as measured in a gambling paradigm in alert and sleep deprived individuals.

Future research may involve combining sleep deprivation and mild intoxication as well as counter measures to sleepiness and mild intoxication such as caffeine and naps.

Masaki, H., Murphy, T.I., Desjardins, J.A., & Segalowitz, S.J. (2011). The error-related negativity associated with different strength of stimulus-response interference. (accepted, Clinical Neurophysiology).

Segalowitz, S.J., Santesso, D.L., Murphy, T.I., Chantziantoniou, D.K., Homan, D., & Khan, S. (2010). Retest reliability of medial frontal negativities during performance monitoring. Psychophysiology, 47, 260-270.

Asaoka, S., Masaki, H., Ogawa, K., Murphy, T.I., Fukuda, K., & Yamazaki, K. Performance monitoring during sleep inertia after a one hour daytime nap. (2010). Journal of Sleep Research, 19, 436-443.

Murphy, T.I., Richard, M., Masaki, H., & Segalowitz, S.J. (2006). The effect of sleepiness on performance monitoring: I know what I am doing, but do I care? Journal of Sleep Research, 15, 11-15.

Murphy, T.I. & Segalowitz, S.J. (2004). Eliminating the P3(00) rebound in short oddball paradigms. International Journal of Psychophysiology, 53, 233-238.

Takeuchi, T., Ogilvie, R.D., Murphy, T.I., & Ferrelli, A.V. (2003). EEG activities during elicited sleep onset REM and NREM periods reflect different mechanisms of dream generation. Clinical Neurophysiology, 114: 210-220.

Takeuchi, T., Fukuda, K., Murphy, T.I. (2002). Elicitation of sleep onset REM periods in normal individuals using the Sleep Interruption Technique (SIT). Sleep Medicine, 3: 479-488.

Takeuchi, T., Fukuda, K., Sasaki, Y., Inugami, M., & Murphy, T.I. (2002). Factors related to the occurrence of isolated sleep paralysis elicited during a multi-phasic sleep-wake schedule. Sleep, 25, 89-96.

Ogilvie, R.D., Takeuchi, T., & Murphy, T.I. (2001). Expanding Nielsen’s Covert REM Model, Questioning Solmms’ Approach to Dreaming and REM Sleep, and Re-interpreting the Vertes and Eastman’s View of REM Sleep and Memory. Behavioral & Brain Sciences, 23, 981-983.