A right hemisphere advantage at early cortical stages of processing alphanumeric stimuli. Evidence from electrophysiology

Asanowicz, Dariusz; Verleger, Rolf; Kruse, Lena; Beier, K.; Śmigasiewicz, Kamila

doi:10.1016/j.bandc.2017.01.007

Cited by 11 publications

(13 citation statements)

References 56 publications

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“…Furthermore, the S1-evoked VEPs displayed a typical pattern of hemispheric asymmetry. The P1 component tended to be larger at the right hemisphere (RH), in line with evidence for a RH advantage at early cortical stages of perceptual processing 28,29 . The N1 component was in turn larger at the left hemisphere (LH), in line with evidence for localization of the visual word form area in the left lateral occipito-temporal sulcus 30 Figure 4.…”

Section: Contingent Negative Variation (Cnv)supporting

confidence: 62%

“…It is therefore arguable that perceiving a letter automatically pre-activates the corresponding S-R link, i.e., an established (through a lifelong practice) binding of perceptual and reading (motor) codes. Future studies might examine this issue by comparing letters to other stimuli, which should be unfamiliar to participants and difficult to verbalize, e.g., Tibetan letters 28 or irregular geometric shapes 39 .…”

Section: Contingent Negative Variation (Cnv)mentioning

confidence: 99%

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The response relevance of visual stimuli modulates the P3 component and the underlying sensorimotor network

Asanowicz

Gociewicz

Koculak

et al. 2020

Sci Rep

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The functional meaning and neural basis of the P3b component of ERPs are still under debate. One of the main issues is whether P3b reflects only stimulus-related processes (stimulus evaluation hypothesis) or response-related processes as well (stimulus-response or S-R link activation hypothesis). Here, we conducted an EEG experiment examining whether P3b may indeed reflect an S-R link activation, followed by an fMRI experiment in which we explored the brain areas and functional connectivity possibly constituting the neural basis of these sensorimotor links. In both experiments, two successive visual stimuli, S1 and S2, were presented with a 1 sec interval, and responses were defined either by S1 or S2, while participants responded only after S2 onset. The obtained EEG results suggest that P3b may be interpreted in terms of the S-R link activation account, although further studies are needed to disentangle P3-related activity from overlapping anticipatory activity. The obtained fMRI results showed that processing of the relevant S1 involved activation of a distributed postero-anterior sensorimotor network, and increased strength of functional connectivity within this network. This network may underlie activation of the S-R links, thus possibly also the P3b component, forming a bridging step between sensory encoding and response execution. In the present study, we conducted two experiments: an EEG experiment aimed at examining the issue of whether P3b may reflect processes related to activation of stimulus-response (S-R) links or "event files", followed by an fMRI experiment aimed at exploring what may constitute the neural basis of these sensorimotor links. EEG Experiment Introduction. Over four decades have passed since Squires, Squires, and Hillyard 1 described the P3b component (that we will further refer to as P3)-a major centro-parietal part of the P300 complex in the human event-related EEG potential (ERP) with a maximal positive deflection at parietal midline (usually the Pz site) at about 300-700 ms after stimulus onset. Years of extensive studies have shown that P3 emerges whenever a task-related or behaviorally-relevant stimulus is perceived, regardless of stimulus and response modalities, and changes in P3 amplitude and latency are related to a wide range of higher-level cognitive processes 2-4. Yet, the functional meaning of P3 as well as its neural underpinnings are still under debate. Answers to the question of "what is the underlying process reflected by P3?" usually fall into one of two general views. The first view is that P3 reflects stimulus processing only, and is neither related to nor affected by processes of response selection and preparation 5,6. Seminal for this approach, the stimulus evaluation account maintains that P3 is a signature of comprehensive evaluation of perceived events. This evaluation entails processes of allocation of perceptual and/or attentional resources to event encoding and categorization 7-9 , and it is often assumed here that P3 amplitude reflects the amount of these...

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Section: Contingent Negative Variation (Cnv)supporting

confidence: 62%

Section: Contingent Negative Variation (Cnv)mentioning

confidence: 99%

The response relevance of visual stimuli modulates the P3 component and the underlying sensorimotor network

Asanowicz

Gociewicz

Koculak

et al. 2020

Sci Rep

Self Cite

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“…However, the LH VEP lag has been found to be largely independent of that advantage: First, the measures did not correlate with each other in a relatively large sample of 55 participants (the largest correlation of several VEP measures with asymmetry of T2 identification amounted to r = 0.05 only, Asanowicz et al, 2017). Second, shifting attention to the right or left side reduced VEP latencies equally on either side, thus did not interact with the LH VEP lag (Asanowicz et al, 2017; Śmigasiewicz et al, 2017a), in contrast to the marked interaction of attention with the LVF advantage of T2 identification (Śmigasiewicz et al, 2015, 2017a,b). Third, the LVF advantage of target identification was virtually identical in right-handers and left-handers whereas the LH VEP lag was strikingly absent in left-handers (Śmigasiewicz et al, 2017c).…”

Section: Introductionmentioning

confidence: 93%

“…Moreover, it was present with different alphanumeric stimulus types. Asanowicz et al (2017) compared VEPs evoked by familiar (Latin) letters and (Arabic) digits to unfamiliar Tibetan letters . Though smaller for Tibetan letters than for familiar letters and digits, the lag was still present.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, both streams must be constantly monitored in search for targets. In this situation, we have observed a right-left asymmetry of visual evoked potentials (VEPs) evoked by the standard stimuli from trial-beginning onwards before any targets were presented: These VEPs, consisting of a sequence of positive–negative peaks (P1 and N1 components) evoked by the sequence of stimuli, appeared slightly earlier over the right hemisphere (RH) than over the left one (LH) (Verleger et al, 2011, 2013; Asanowicz et al, 2017). Both P1 and N1 have generators in extrastriate occipital and temporal (fusiform) cortex (Di Russo et al, 2002; Rossion et al, 2003) and are known to increase by top-down focusing of attention (Heinze et al, 1990; Vogel and Luck, 2000) and to be speeded by brightness (Johannes et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

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Left-Hemisphere Delay of EEG Potentials Evoked by Standard Letter Stimuli During Rapid Serial Visual Presentation: Indicating Right-Hemisphere Advantage or Left-Hemisphere Load?

2019

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During rapid serial visual presentation (RSVP), two streams of letters simultaneously presented in the left and right visual fields (LVF and RVF) evoke visual potentials (VEPs) of EEG a few milliseconds earlier at the right (RH) than the left hemisphere (LH). This small LH VEP lag might be attributed to a RH advantage in initial processing of rapidly changing stimuli or to larger load of the LH by its specialized processing of letters from both visual fields simultaneously. In the present study, the two-stream condition was compared in two experiments to conditions with smaller instantaneous verbal load, namely with stimuli presented either solely or slightly earlier in the LVF or RVF. The RH advantage hypothesis predicts a LH VEP lag very similar to the standard two-stream condition when comparing between LH and RH VEPs contralateral to the single or earlier stream. The LH load hypothesis predicts shorter VEP latencies at the LH in the one-stream and earlier-stream than in the two-stream condition, resulting in an absent LH lag in those conditions. Results tended to be more in line with these latter predictions suggesting that in RSVP the LH might be more involved in partial processing of letters in search for target features. However, since the RH advantage hypothesis could not be reliably rejected these results might indicate a complex interplay between both hemispheres. This interplay would exploit the abilities of either hemisphere during the demanding processing of rapidly presented letters, both the LH advantage in letter processing and the RH advantage in visual perception at initial stages.

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Lateralization of spatial rather than temporal attention underlies the left hemifield advantage in rapid serial visual presentation

Asanowicz

Kruse

Śmigasiewicz

et al. 2017

Brain and Cognition

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A right hemisphere advantage at early cortical stages of processing alphanumeric stimuli. Evidence from electrophysiology

Cited by 11 publications

References 56 publications

The response relevance of visual stimuli modulates the P3 component and the underlying sensorimotor network

The response relevance of visual stimuli modulates the P3 component and the underlying sensorimotor network

Left-Hemisphere Delay of EEG Potentials Evoked by Standard Letter Stimuli During Rapid Serial Visual Presentation: Indicating Right-Hemisphere Advantage or Left-Hemisphere Load?

Lateralization of spatial rather than temporal attention underlies the left hemifield advantage in rapid serial visual presentation

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