This research was supported by a grant form the National Institute of Health to Dr. Hackley (MH47746). Portions of this research were reported at the 34th and 35th annual meetings of the Society for Psychophysiological Research (Sollers & Hackley, 1993. 1994) and in a master' thesis by mr. Sollers.
Effects of foreperiod duration on reflexive and voluntary responses to intense noise bursts
Version of Record online: 30 JAN 2007
Volume 34, Issue 5, pages 518–526, September 1997
How to Cite
SOLLERS, J. J. and HACKLEY, S. A. (1997), Effects of foreperiod duration on reflexive and voluntary responses to intense noise bursts. Psychophysiology, 34: 518–526. doi: 10.1111/j.1469-8986.1997.tb01738.x
We thank jason Burke for technical assistance and Drs. Steve Luck, Jeff Miller, Phil Holcomb and Jon Hansen for contributions of computer software of their own authorship.
- Issue online: 30 JAN 2007
- Version of Record online: 30 JAN 2007
- (Received November 27, 1995; Accepted January 13, 1997)
- Immediate arousal;
- Auditory attention;
- Brain stem;
- Orbicularis oculi;
The question of whether a common mechanism underlies the facilitation of voluntary and reflexive reactions by a warning stimulus was investigated in two experiments. In both studies, the foreperiod preceding an intense noise burst was manipulated within and between blocks of trials. Previous reaction time experiments have shown that individuals respond fastest at the shortest foreperiod for between-block manipulations and fastest at the longest foreperiod when foreperiod duration is varied unpredictably from trial to trial. In the present research, this pattern was found for voluntary hand-grip responses, but acoustic startle blinks were facilitated at long foreperiods for both within- and between-block manipulations. Invariance of the trisynaptic postauricular reflex across foreperiod conditions was evidence against any general activation of low-level motor pathways by warning stimuli. Analyses of nonreflexive lid movements subsequent to startle blink suggested that inhibition of spontaneous blinking during the foreperiod may have contributed to the unexpected divergence between voluntary reactions and eyeblink reflexes.