Biomaterial Database

Reaction time to motion onset and magnitude estimation of velocity in the presence of background motion. 2011

Nele Kuldkepp, and Kairi Kreegipuu, and Aire Raidvee, and Jüri Allik

Institute of Psychology, Estonian Center of Behavioral and Health Sciences, University of Tartu, Estonia. nele.kuldkepp@ut.ee

Reaction times (RT) to motion onset of a target grating moving at 0.4, 0.6, 0.8, 1.0 or 1.6 °/s and magnitude estimation of the same velocities were studied in the presence of the surrounding background motion which was either in the same or opposite direction. Surprisingly, we found no relative motion effect: if the background motion, irrespective of its direction, affected the target, then it delayed the RTs and decreased velocity ratings. The background motion was effective on RTs to motion onset only when the target was relatively small and immediately surrounded by a moving background. Increases in RTs were mostly explained by an apparent slowdown of the target stimulus velocity which was caused by the interference from the moving background. The background motion also affected velocity ratings by decreasing them without systematic effect of the background motion direction.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D009039	Motion Perception	The real or apparent movement of objects through the visual field.	Movement Perception,Perception, Motion,Perception, Movement
D010775	Photic Stimulation	Investigative technique commonly used during ELECTROENCEPHALOGRAPHY in which a series of bright light flashes or visual patterns are used to elicit brain activity.	Stimulation, Photic,Visual Stimulation,Photic Stimulations,Stimulation, Visual,Stimulations, Photic,Stimulations, Visual,Visual Stimulations
D011930	Reaction Time	The time from the onset of a stimulus until a response is observed.	Response Latency,Response Speed,Response Time,Latency, Response,Reaction Times,Response Latencies,Response Times,Speed, Response,Speeds, Response
D005260	Female		Females
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D017603	Signal Detection, Psychological	Psychophysical technique that permits the estimation of the bias of the observer as well as detectability of the signal (i.e., stimulus) in any sensory modality. (From APA, Thesaurus of Psychological Index Terms, 8th ed.)	Signal Detection (Psychology),Signal Detection Analysis,Signal Detection Theory,Analyses, Signal Detection,Analysis, Signal Detection,Detection, Psychological Signal,Detection, Signal (Psychology),Detections, Psychological Signal,Detections, Signal (Psychology),Psychological Signal Detection,Psychological Signal Detections,Signal Detection Analyses,Signal Detection Theories,Signal Detections (Psychology),Signal Detections, Psychological,Theories, Signal Detection,Theory, Signal Detection
D055815	Young Adult	A person between 19 and 24 years of age.	Adult, Young,Adults, Young,Young Adults