ERPLAB Toolbox is a freely available, open-source toolbox for processing and analyzing event-related potential (ERP) data in the MATLAB environment. closely integrated with EEGLAB, popular that provides many EEG preprocessing steps an excellent user interface design. adds to EEGLAB's functions, providing additional tools filtering, artifact detection, re-referencing, sorting of events, among others. also robust averaging segments together create averaged ERPs, creating difference waves other...

Luck, Steven J., Leonardo Chelazzi, A. Hillyard, and Robert Desimone. Neural mechanisms of spatial selective attention in areas V1, V2, V4 macaque visual cortex. J. Neurophysiol. 77: 24–42, 1997. Many neurons extrastriate cortex have large receptive fields, this may lead to significant computational problems whenever multiple stimuli fall within a single field. Previous studies suggested that when cell's field, they compete for the response manner can be biased favor attended stimuli. In...

Abstract Event‐related brain potentials (ERPs) were recorded from normal young adults during visual search tasks in which the stimulus arrays contained either eight identical items (homogeneous arrays) or seven and one deviant item (pop‐out arrays). Four experiments conducted different classes of designated targets remaining nontargets. In Experiments 1 2, both target nontarget pop‐out stimuli elicited an enhanced anterior N2 wave a contralaterally larger posterior P1 wave, but 3 4...

Both physiological and behavioral studies have suggested that stimulus–driven neural activity in the sensory pathways can be modulated amplitude during selective attention. Recordings of event–related brain potentials indicate such gain control or amplification processes play an important role visual–spatial Combined potential neuroimaging experiments provide strong evidence attentional operates at early stage visual processing extrastriate cortical areas. These data support selection...

The identification of targets in visual search arrays may be improved by suppressing competing information from the surrounding distractor items. present study provided evidence that this hypothetical filtering process has a neural correlate, "N2pc" component event-related potential waveform. N2pc was observed when target item surrounded items but absent array could rejected as nontarget on basis simple feature information. In addition, eliminated discouraged removing items, making...

Abstract ERP experiments generate massive datasets, often containing thousands of values for each participant, even after averaging. The richness these datasets can be very useful in testing sophisticated hypotheses, but this also creates many opportunities to obtain effects that are statistically significant do not reflect true differences among groups or conditions (bogus effects). purpose paper is demonstrate how common and seemingly innocuous methods quantifying analyzing lead high rates...

Working memory can be divided into separate subsystems for verbal and visual information. Although the system has been well characterized, storage capacity of working not yet established simple features or conjunctions features. The authors demonstrate that it is possible to retain information about only 3-4 colors orientations in at one time. Observers are also able both color orientation objects, indicating stores integrated objects rather than individual Indeed, defined by a conjunction...

Many previous studies have demonstrated that the visual N1 component is larger for attended‐location stimuli than unattended‐location stimuli. This difference observed typically only tasks involving a discrimination of stimuli, suggesting wave reflects process applied to attended location. The present study tested this hypothesis by examining elicited under conditions either required or did not require subject perform discrimination. Specifically, foveal during choice‐reaction time (RT) was...

When an observer detects a target in rapid stream of visual stimuli, there is brief period time during which the detection subsequent targets impaired. In this study, event-related potentials (ERPs) were recorded from normal adult observers to determine whether "attentional blink" reflects suppression perceptual processes or impairment postperceptual processes. No was observed attentional blink interval for ERP components corresponding sensory processing (the P1 and N1 components) semantic...

Abstract Electromagnetic data collected using electroencephalography ( EEG ) and magnetoencephalography MEG are of central importance for psychophysiological research. The scope concepts, methods, instruments used by / researchers has dramatically increased is expected to further increase in the future. Building on existing guideline publications, goal present paper contribute effective documentation communication such advances providing updated guidelines conducting reporting studies. also...

Three experiments were conducted to determine whether attention-related changes in luminance detectability reflect a modulation of early sensory processing. Experiments 1 and 2 used peripheral cues direct attention found substantial effects cue validity on target detectability; these consistent with sensory-level locus selection but not certain memory- or decision-level mechanisms. In Experiment 3, event-related brain potentials recorded similar paradigm using central cues, was produce...

How long does it take to form a durable representation in visual working memory?Several theorists have proposed that this consolidation process is very slow.Here, we measured the time course of consolidation.Observers performed change-detection task for colored squares, and shortly after presentation first array, pattern masks were presented at locations each squares disrupt representations had not yet been consolidated.Performance on memory was impaired when delay between short, effect...

To determine whether data quality is meaningfully reduced by high electrode impedance, EEG was recorded simultaneously from low- and high-impedance sites during an oddball task. Low-frequency noise found to be increased at relative low-impedance sites, especially when the recording environment warm humid. The caused increase in number of trials needed obtain statistical significance analyses P3 amplitude, but this could partially mitigated high-pass filtering artifact rejection. High...