What does aftersensation mean?
An aftersensation is a feeling or perception that lingers after the stimulus that caused it has been removed. The classic example is visual: stare at a bright light or a strongly colored shape, then look away, and a ghostly image remains — often in complementary colors — even though nothing is actually there. Aftersensations can also occur in other senses, as when a sound seems to echo faintly after it has stopped. The term belongs mainly to the vocabulary of psychology, physiology, and vision science, where researchers study how sensory receptors and the brain continue responding briefly after input ends. It is closely related to, and broader than, the more familiar term 'afterimage,' which is restricted to sight. Because it captures the curious gap between the world and our perception of it, the aftersensation has long interested scientists studying how the visual system encodes color, brightness, and motion.
nounA sensation that continues or recurs after the external stimulus that produced it has ceased, such as an image lingering in the eye after looking at a bright object.
- A sensory experience that persists after the physical stimulus has ended, especially a visual image retained after looking at a bright or contrasting object.
- More generally, any residual perception in senses such as hearing or touch that outlasts the stimulus that caused it.
"Even after the flashbulb went dark, a bright aftersensation floated before her eyes."
"The psychologist asked subjects to describe the color of the aftersensation left by the rotating spiral."
"Long after the bell had stopped ringing, he was aware of a faint aftersensation humming in his ears."
Standard plural, used when discussing multiple instances or types of lingering sensation.
"Subjects described several distinct aftersensations following exposure to the flickering display."
Stare at a lightbulb, close your eyes, and the glow you still see is your brain refusing to let go — scientists call it an aftersensation.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of aftersensation
The word aftersensation is formed transparently from English 'after' combined with 'sensation,' which derives from the Latin 'sensus' (perception, feeling) via Old French 'sensacion.' It emerged in nineteenth-century scientific writing as psychologists and physiologists sought precise terminology for perceptual phenomena that outlast their stimuli. It shares its root with words such as 'sense,' 'sensory,' and 'sensibility,' all tracing back to the same Latin source.
Related word forms
How aftersensation is actually used
Aftersensation is a technical term used chiefly in psychology, physiology, and vision science rather than in everyday conversation. In casual contexts people more often say 'afterimage' for visual cases. The word is neutral in connotation and appears mostly in scientific writing.
Easily confused with aftersensation
An afterimage is specifically the visual impression left on the retina, whereas an aftersensation is the broader term covering any lingering sensation in any sense, including touch and hearing.
An aftereffect is any consequence that follows a stimulus or event, while an aftersensation refers strictly to a continued sensory experience.
Aftertaste is limited to flavors lingering in the mouth, whereas aftersensation applies to sensations across all the senses.