Abstract.
Subjects sometimes fail to suppress a reflexive saccade towards the flashed stimulus in an anti-saccade task. Here, we studied how error rates in the anti-saccade task varied as a function of saccadic probability. Ten subjects performed 200 anti-saccade trials for each of three saccade-direction probability conditions (20%, 50%, and 80%). We found that as the likelihood of a saccade in a given direction increased, the percentage of pro-saccade errors also increased for stimulus presentations in this direction. These results provide support for the hypothesis that errors in the anti-saccade task are the result of an increased level of motor preparation.
Similar content being viewed by others
References
Basso MA, Wurtz RH (1998) Modulation of neuronal activity in superior colliculus by changes in target probability. J Neurosci 18:7519–7534
Bell AH, Everling S, Munoz DP (2000) Influence of stimulus eccentricity and direction on characteristics of pro- and antisaccades in non-human primates. J Neurophysiol 84:2595–2604
Broerse A, Crawford TJ, den Boer JA (2001) Parsing cognition in schizophrenia using saccadic eye movements: a selective overview. Neuropsychologia 39:742–756
Dorris MC, Munoz DP (1995) A neural correlate for the gap effect on saccadic reaction times in monkey. J Neurophysiol 73:2558–2562
Dorris MC, Munoz DP (1998) Saccadic probability influences motor preparation signals and time to saccadic initiation. J Neurosci 18:7015–7026
Dorris MC, Pare M, Munoz DP (1997) Neuronal activity in monkey superior colliculus related to the initiation of saccadic eye movements. J Neurosci 17:8566–8579
Everling S, Fischer B (1998) The antisaccade: a review of basic research and clinical studies. Neuropsychologia 36:885–899
Edelman JA, Keller EL (1996) Activity of visuomotor burst neurons in the superior colliculus accompanying express saccades. J Neurophysiol 76:908–926
Everling S, Munoz DP (2000) Neuronal correlates for preparatory set associated with pro-saccades and anti-saccades in the primate frontal eye field. J Neurosci 20:387–400
Everling S, Dorris MC, Munoz DP (1998a) Reflex suppression in the anti-saccade task is dependent on prestimulus neural processes. J Neurophysiol 80:1584–1589
Everling S, Pare M, Dorris MC, Munoz DP (1998b) Comparison of the discharge characteristics of brain stem omnipause neurons and superior colliculus fixation neurons in monkey: implications for control of fixation and saccade behavior. J Neurophysiol 79:511–528
Fischer B, Weber H (1997) Effects of stimulus conditions on the performance of antisaccades in man. Exp Brain Res 116:191–200
Forbes K, Klein RM (1996) The magnitude of the fixation offset effect with endogenously and exogenously controlled saccades. J Cogn Neurosci 8:344–352
Hallett PE (1978) Primary and secondary saccades to goals defined by instructions. Vision Res 18:1279–1296
Hallett PE, Adams BD (1980) The predictability of saccadic latency in a novel voluntary oculomotor task. Vision Res 20:329–339
Hess WR, Burgi S, Bucher V (1946) Motor function of tectal and tegmental area. Monatsschr Psychiatr Neurol 112:1–52
Munoz DP, Everling S (2004a) Look away: the anti-saccade task and the voluntary control of eye movement. Nat Rev Neurosci 5:218–228
Munoz DP, Schall JD (2004b) Concurrent, distributed control of saccade initiation in the frontal eye field and superior colliculus. In: Hall WC, Moschovakis AK (eds) The superior colliculus: new approaches for studying sensorimotor integration. CRC Press, Boca Raton, pp 55–82
Munoz DP, Broughton JR, Goldring JE, Armstrong IT (1998) Age-related performance of human subjects on saccadic eye movement tasks. Exp Brain Res 121:391–400
Pare M, Munoz DP (1996) Saccadic reaction time in the monkey: advanced preparation of oculomotor programs is primarily responsible for express saccade occurrence. J Neurophysiol 76:3666–3681
Reuter-Lorenz PA, Hughes HC, Fendrich R (1991) The reduction of saccadic latency by prior offset of the fixation point: an analysis of the gap effect. Percept Psychophys 49:167–175
Sommer MA (1994) Express saccades elicited during visual scan in the monkey. Vision Res 34:2023–2038
Walker R, Husain M, Hodgson TL, Harrison J, Kennard C (1998) Saccadic eye movement and working memory deficits following damage to human prefrontal cortex. Neuropsychologia 36:1141–1159
Acknowledgements.
We thank Matthew Brown for his assistance in data analysis. We also thank two anonymous reviewers for very helpful comments on the manuscript. This work was supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) and the National Alliance for Research on Schizophrenia and Depression (NARSAD). S.E. is a Canadian Institutes of Health Research New Investigator and an EJLB Research Scholar.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Koval, M.J., Ford, K.A. & Everling, S. Effect of stimulus probability on anti-saccade error rates. Exp Brain Res 159, 268–272 (2004). https://doi.org/10.1007/s00221-004-2104-x
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00221-004-2104-x