Biomaterial Database

Task redundancy and an enhancement of the late positive components in human visual evoked potentials. 1981

S Kitajima, and H Murohashi, and M Kanoh

VEPs to four or six repetitive letter and checkerboard stimuli were measured. These stimuli were presented in a first triplet and a single stimulus or in first and second triplets. Three stimuli in a triplet were identical. The subject's task was either naming the letter stimulus or pattern matching the checkerboard. A degree of task-redundancy of the stimuli at intratrial stimulus positions 2 and 3 was varied by means of stimulus duration and indication of the task stimulus prior to the triplet. The stimulus duration was 300 msec and the prior information of the task stimulus was delivered by a letter or checkerboard warning stimulus (WS) in session 1. The stimulus duration was shorter (10 msec in session 2, 20 microseconds in session 3) and the WS of random pattern did not deliver the information of the task stimulus in session 2 and 3. At stimulus positions 2 and 3, the P260 of the occipital VEP enhanced in amplitude for the letter and checkerboard stimuli in session 1, whereas the P260 decreased in amplitude for both stimuli at the same positions in session 3.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D009778	Occipital Lobe	Posterior portion of the CEREBRAL HEMISPHERES responsible for processing visual sensory information. It is located posterior to the parieto-occipital sulcus and extends to the preoccipital notch.	Annectant Gyrus,Calcarine Fissure,Calcarine Sulcus,Cuneate Lobule,Cuneus,Cuneus Cortex,Cuneus Gyrus,Gyrus Lingualis,Lingual Gyrus,Lunate Sulcus,Medial Occipitotemporal Gyrus,Occipital Cortex,Occipital Gyrus,Occipital Region,Occipital Sulcus,Sulcus Calcarinus,Calcarine Fissures,Calcarinus, Sulcus,Cortex, Cuneus,Cortex, Occipital,Cortices, Cuneus,Cortices, Occipital,Cuneate Lobules,Cuneus Cortices,Fissure, Calcarine,Fissures, Calcarine,Gyrus Linguali,Gyrus, Annectant,Gyrus, Cuneus,Gyrus, Lingual,Gyrus, Medial Occipitotemporal,Gyrus, Occipital,Linguali, Gyrus,Lingualis, Gyrus,Lobe, Occipital,Lobes, Occipital,Lobule, Cuneate,Lobules, Cuneate,Occipital Cortices,Occipital Lobes,Occipital Regions,Occipitotemporal Gyrus, Medial,Region, Occipital,Regions, Occipital,Sulcus, Calcarine,Sulcus, Lunate,Sulcus, Occipital
D011214	Practice, Psychological	Performance of an act one or more times, with a view to its fixation or improvement; any performance of an act or behavior that leads to learning.	Practice (Psychology),Practice, Psychology,Practicing, Psychological,Practicing, Psychology,Psychological Practice,Psychological Practicing,Psychology Practice,Psychology Practicing
D011340	Problem Solving	A learning situation involving more than one alternative from which a selection is made in order to attain a specific goal.
D004193	Discrimination Learning	Learning that is manifested in the ability to respond differentially to various stimuli.	Discriminative Learning,Discrimination Learnings,Discriminative Learnings,Learning, Discrimination,Learning, Discriminative
D004569	Electroencephalography	Recording of electric currents developed in the brain by means of electrodes applied to the scalp, to the surface of the brain, or placed within the substance of the brain.	EEG,Electroencephalogram,Electroencephalograms
D005074	Evoked Potentials, Visual	The electric response evoked in the cerebral cortex by visual stimulation or stimulation of the visual pathways.	Visual Evoked Response,Evoked Potential, Visual,Evoked Response, Visual,Evoked Responses, Visual,Potential, Visual Evoked,Potentials, Visual Evoked,Response, Visual Evoked,Responses, Visual Evoked,Visual Evoked Potential,Visual Evoked Potentials,Visual Evoked Responses
D005260	Female		Females
D005556	Form Perception	The sensory discrimination of a pattern, shape, or outline.	Contour Perception,Contour Perceptions,Form Perceptions,Perception, Contour,Perception, Form,Perceptions, Contour,Perceptions, Form
D006185	Habituation, Psychophysiologic	The disappearance of responsiveness to a repeated stimulation. It does not include drug habituation.	Habituation (Psychophysiology),Habituation, Psychophysiological,Psychophysiologic Habituation,Psychophysiological Habituation,Habituations (Psychophysiology)