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An effect following its cause after some delay, especially a delayed or prolonged physiological or psychological response to a stimulus.


1. any result occurring some time after its cause
2. (Medicine) med any delayed response to a stimulus or agent. Compare side effect
3. (Psychology) psychol any illusory sensation caused by a stimulus that has ceased


(ˈæf tər ɪˌfɛkt, ˈɑf-)

a delayed effect, as one that follows at some interval after the stimulus that produced it.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.aftereffect - any result that follows its cause after an intervalaftereffect - any result that follows its cause after an interval
consequence, effect, result, upshot, outcome, event, issue - a phenomenon that follows and is caused by some previous phenomenon; "the magnetic effect was greater when the rod was lengthwise"; "his decision had depressing consequences for business"; "he acted very wise after the event"
2.aftereffect - a delayed effect of a drug or therapyaftereffect - a delayed effect of a drug or therapy; "the drug had unexpected aftereffects"
effect - a symptom caused by an illness or a drug; "the effects of sleep loss"; "the effect of the anesthetic"
References in periodicals archive ?
Hearing loss A is the most common aftereffect of meningitis.
In the face aftereffect, we adapt to a face with a particular expression - happiness, for example - which causes us to perceive a subsequent neutral face as having the opposite facial expression (i.
The presence of the aftereffect suggests that the motor command had been updated in anticipation of the upcoming force perturbation [2-5].
But ``Extremes'' may have a more lingering, disturbing aftereffect than the American throwaway fright films we're accustomed to, or indeed the formulaic Asian shockers, like the original ``Ring'' and ``Grudge'' movies, that have recently been so popular.
Scientists try to find the answers to this age-old illusion that was first documented by Aristotle, and later called the Motion Aftereffect by today's scientists.
The haze, an aftereffect of fossil-fuel burning, forest-fire smoke and emissions from stoves burning wood and animal waste, has been hanging over Asia and is now moving to other areas of the globe.
But the motion aftereffect may not be automatic after all, according to a study in the March 1 NATURE.
The Nazi persecution of gays, while not on the scale of the Holocaust and many of the regime's other brutal crimes, certainly had a uniquely insidious aftereffect.
His walk was steady, if deliberate, and his voice was much weaker than his traditional booming baritone, possibly an aftereffect of the double pneumonia that he suffered in January after a major heart bypass operation in November.
3% and a decrease in the percentage of discharge with aftereffects from 32.
Enjoying a good scare may seem like fun at the time, but the aftereffects can be frightening, reveals communications specialist Glenn Sparks, author of Refrigerator Rights: Our Crucial Need for Close Relationships and Rolling in Dough: Lessons I Learned in a Doughnut Shop.