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2 edition of effect of stimulus location on the major components of the visual evoked response. found in the catalog.

effect of stimulus location on the major components of the visual evoked response.

Catheryn Jane Nesfield

effect of stimulus location on the major components of the visual evoked response.

by Catheryn Jane Nesfield

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Published by Aston University. Department of Vision Sciences in Birmingham .
Written in English


Edition Notes

Thesis (PhD) - Aston University, 1992.

ID Numbers
Open LibraryOL13907479M

Visual stimuli are the most basic aspect of the experimental protocol, and often the most critical one as the choice of stimuli and of their parameters may define and limit the scope of your experiments. Psykinematix provides convenient tools to specify their spatial, temporal, and chromatic properties. smallsignal,orresponse,fromthelarger"noise"oftheEEC. Evokedresponses are time-locked to a repetitivestimulus, and v/hen summed, theyprovide a record of theresponse to.

steady state visual evoked potential (SSVEP) is the most commonly used due to its quick response and accuracy. SSVEP stimuli are typically generated by varying the luminance of a target for a set number of frames or display events. Conventionally, SSVEP based BCI paradigms use magnitude (amplitude). multifocal visual evoked potential. 5° 54° Fig. 1. The schematic representation of multifocal visual evoked stimulus. Each of the 60 sectors of the display is an independent stimulus with 16 checks, 8 black and 8 white. proximation of the largest amplitude of visual evoked potential. In this study, the mfVEP was conducted on the normal eyes.

Psychology Definition of STIMULUS FUNCTION: Stimulus function is to evoke the response in an organism is the function of stimulus. In operant conditioning, a stimulus is presented to act as a signal. Abstract: It has been long debated whether averaged electrical responses recorded from the scalp result from stimulus-evoked brain events or stimulus-induced changes in ongoing brain dynamics. In a human visual selective attention task, we show that nontarget event-related potentials were mainly generated by partial stimulus-induced phase.


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Effect of stimulus location on the major components of the visual evoked response by Catheryn Jane Nesfield Download PDF EPUB FB2

Selective attention to stimulus location modulates the steady-state visual evoked potential. S T Morgan, J C Hansen, and S A Hillyard Department of Neurosciences, University of California at San Diego, La Jolla,by: It has been established that changing stimulus specificity such as luminance contrast or spatial frequency can alter the neuronal activity and thus modulate the visual-evoked response.

In this paper, we study the effect that stimulus specificity has on the classification performance of a steady-state visual-evoked potential-based brain-computer Cited by: The relationship between the latencies and amplitudes of the N1 and P2 components of the visual evoked potential (VEP) and the psychophysiological state of the brain immediately preceding the time of the stimulus has been investigated in 7 male subjects.

The between-subjects effect of pre-stimulus EEG on N1 latency was small, but was Cited by: Abstract. The purpose of this study was to assess changes in the response profile of the pattern visual evoked potential (VEP) using three stimulus configurations simulating visual-field scotomas: central circular and central blank fields increasing incrementally in diameter from 1° to 15°, hemi-field, and quadrant by: The visual-evoked potential (VEP) refers to the electrophysiological signal obtained from correlated neural activity in the visual cortex in response to a time-locked visual stimulus [27].

An evoked potential or evoked response is an electrical potential in a specific pattern recorded from a specific part of the nervous system, especially the brain, of a human or other animals following presentation of a stimulus such as a light flash or a pure ent types of potentials result from stimuli of different modalities and types.

EP is distinct from spontaneous potentials as MeSH: D The terms visually evoked potential (VEP), visually evoked response (VER) and visually evoked cortical potential (VECP) are equivalent. They refer to electrical potentials, initiated by brief visual stimuli, which are recorded from the scalp overlying visual cortex, VEP waveforms are extracted from the electro-encephalogram (EEG) by signal.

Grouping elements of a visual stimulus is shown to reduce the amplitude of the bipolar occipital evoked potential in three experiments. The first shows similar effects of grouping elements on the horizontal and vertical dimensions, combining in a nearly additive manner.

The second shows a less stable grouping effect using irregularly spaced lines as by: 3. Auditory evoked potentials (AEPs) are obtained by stimulating the cochlear nerve using clicks generated by headphones and recording cerebral activity via scalp electrodes (Fig.

).The early part of the AEP waveform (first 10 ms) is referred to as BAEP or brainstem auditory evoked response (BAER), representing passage of the impulse through the brainstem (Freye, ).

To decompose sensory event-related brain potentials (ERPs) into a set of independent components according to the modality and the spatial location of the eliciting sensory stimulus, and thus.

Occurs when the controlling antecedent stimulus and the response or response product (1) share the same sense mode (e.g., both stimulus and response are visual, auditory, or tactile) and (2) physically resemble each other.

The stimulus–response model is a characterization of a statistical unit (such as a neuron).The model allows the prediction of a quantitative response to a quantitative stimulus, for example one administered by a psychology, stimulus response theory concerns forms of classical conditioning in which a stimulus becomes paired response in a subject's mind.

An evoked response (ER) or evoked potential (EP) is an electrical response of the brain to a visual, auditory or somatosensory stimulus. The transient electrical event recorded at the scalp in response to a visual stimulus of shifting pattern of squares is named pattern shift visual evoked response (PSVER).

when an antecedent stimulus has a history of evoikking a response that has been reinforced in its presence, the same type of behavior tends to be evoked by stimuli that share similar physical properties with the controlling antecedent stimulus.

Evoked Potentials (stimulus or event-related) Visual Evoked Potential (VEP) is the measured brain response that is the direct result of a specific sensory, cognitive, or motor event.

The stimulus-evoked population response in visual cortex of awake monkey is a propagating wave Lyle Muller1,*, Alexandre Reynaud2,*, Fre´de´ric Chavane2 & Alain Destexhe1 Propagating waves occur in many excitable media and were recently found in neural systems from retina to neocortex.

While propagating waves are clearly present under. The N1 is elicited by visual stimuli, and is part of the visual evoked potential – a series of voltage deflections observed in response to visual onsets, offsets, and changes. Both the right and left hemispheres generate an N1, but the laterality of the N1 depends on whether a stimulus is presented centrally, laterally, or bilaterally.

response 1. Bridge a bid replying to a partner's bid or double 2. Christianity a short sentence or phrase recited or sung by the choir or congregation in reply to the officiant at a church service 3. Electronics the ratio of the output to the input level, at a particular frequency, of a transmission line or electrical device 4.

any pattern of glandular. The vision system. Light travels to the eye and passes through the cornea, the pupil (regulated in size by the iris), and the lens and then moves to the retina, where it strikes the photoreceptors for vision, the cones and the cones, in the center (fovea) of the retina, are responsible for color vision, and operate best in intense illumination.

Evoked potentials (EPs), or evoked responses, measure the electrophysiologic responses of the nervous system to a variety of stimuli. In theory, almost any sensory modality can be tested; however, in clinical practice, only a few are used on a routine basis. Visually-evoked Potential in Humans Related to the Motion of a Stimulus ROBERT J.

SNOWDEN,* DIETER ULLRICH,t MICHAEL BACHt Received 9 February ; in revised form 3 August We have examined the visual potential evoked by two motion stimuli. In the first stimulus (termed.When an antecedent stimulus has a history of evoking a response that has been reinforced in its presence, the same type of behavior tends to be evoked by stimuli that share similar physical properties with the controlling antecedent stimulus: Stimulus Generalization.Visual evoked potentials is an important visual electrophysiological tool which has been used for the evaluation of visual field defects in primary open-angle glaucoma and is an appropriate objective measure of optic nerve function.

Significant correlations between the magnitude of the VEP parameters and MD of Humphrey static perimetry suggest that the impaired visual cortical responses Cited by: 5.