Visual Feature and Conjunction Searches of Equal Difficulty Engage Only Partially Overlapping Frontoparietal Networks

Donner, Tobias H.; Kettermann, Andreas; Diesch, Eugen; Ostendorf, Florian; Villringer, Arno; Brandt, Stephan A.

doi:10.1006/nimg.2001.0951

Cited by 164 publications

(146 citation statements)

References 46 publications

(91 reference statements)

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“…Grapheme-color synesthetes showed not only a threefold increase of global intrinsic network connectivity compared with controls, but also specific (quantitative) differences in the intrinsic network connectivity: the two visual ICNs were significantly more strongly connected to the rightlateralized frontoparietal ICN in synesthetes compared with nonsynesthetes. This is in accordance with the known role of frontoparietal networks in color-form binding for normal perception (Donner et al, 2002) and previous studies reporting attenuation of synesthetic binding following transcranial magnetic stimulation of the right parietal cortex (Esterman et al, 2006;Muggleton et al, 2007).…”

Section: Discussionsupporting

confidence: 93%

Intrinsic Network Connectivity Reflects Consistency of Synesthetic Experiences

Dovern

Fink

et al. 2012

J. Neurosci.

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Studying cognitive processes underlying synesthesia, a condition in which stimulation of one sensory modality automatically leads to abnormal additional sensory perception, allows insights into the neural mechanisms of normal and abnormal cross-modal sensory processing.Consistent with the notion that synesthesia results from hyperconnectivity, functional connectivity analysis (adopting independent component analysis and seed-based correlation analysis) of resting-state functional magnetic resonance imaging data of 12 graphemecolor synesthetes and 12 nonsynesthetic control subjects revealed, in addition to increased intranetwork connectivity, both a global and a specific (medial and lateral visual networks to a right frontoparietal network) increase of intrinsic internetwork connectivity in grapheme-color synesthesia. Moreover, this increased intrinsic network connectivity reflected the strength of synesthetic experiences. These findings constitute the first direct evidence of increased functional network connectivity in synesthesia.In addition to this significant contribution to the understanding of the neural mechanisms of synesthesia, our results have important general implications. In combination with data derived from clinical populations, our data strongly suggest that altered differences in intrinsic network connectivity are directly related to the phenomenology of human experiences.

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Section: Discussionsupporting

confidence: 93%

Intrinsic Network Connectivity Reflects Consistency of Synesthetic Experiences

Dovern

Fink

et al. 2012

J. Neurosci.

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“…The searchrelated contrast (full set-single set) showed activity of the dorsolateral prefrontal cortex and the premotor cortex. Numerous previous studies reported identical or very similar areas in association with either increased effort in search [Donner et al, 2002;Nobre et al, 2003] or with related attention tasks, especially those involving endogenous attentional and oculomotor shifts [Corbetta, 1998; for reviews see Coull and Nobre, 1998;Kastner and Ungerleider, 2000]. The increased activity may reflect the additional spatial orienting associated with the presence of more items.…”

Section: Prefrontal Areasmentioning

confidence: 79%

Prioritizing new over old: An fMRI study of the preview search task

Olivers

Smith

Matthews

et al. 2004

Human Brain Mapping

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Abstract:In visual search, observers can successfully ignore temporally separated distractors that are presented as a preview before onset of the search display. Previous behavioral studies have demonstrated the involvement of top-down selection mechanisms in preview search, biasing attention against the old set in favor of the more relevant new set. Using functional magnetic resonance imaging, we replicate and extend findings showing the involvement of superior and inferior parietal areas in the preview task when compared to both a relatively easy single-set search task and a more effortful full-set search task. In contrast, the effortful full-set search showed activation in the dorsolateral prefrontal cortex when compared to the single-set search, suggesting that this area is involved in rejecting additional distractors that could not be separated in time. Hum Brain Mapp 24:69 -78, 2005.

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“…It should be noted, however, that there is much debate surrounding the role of the SPL in visual feature binding. Many studies suggest that effects in this region during visual conjunction search are primarily attributable not to the binding of features but to the deployment of spatial attention (Donner et al, 2002;Shafritz et al, 2002;Nobre et al, 2003), argued to be a necessary precursor to visual feature binding (Treisman and Gelade, 1980). Within the context of this hypothesis, the present result might be related to a preemptive deployment of attention in preparation for the upcoming target shape in the two-word composition condition because participants are aware binding will be needed for their forthcoming decision given the preceding adjective.…”

Section: Full-brain Comparisonsmentioning

confidence: 99%

Simple Composition: A Magnetoencephalography Investigation into the Comprehension of Minimal Linguistic Phrases

2011

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The expressive power of language lies in its ability to construct an infinite array of ideas out of a finite set of pieces. Surprisingly, few neurolinguistic investigations probe the basic processes that constitute the foundation of this ability, choosing instead to focus on relatively complex combinatorial operations. Contrastingly, in the present work, we investigate the neural circuits underlying simple linguistic composition, such as required by the minimal phrase "red boat." Using magnetoencephalography, we examined activity in humans generated at the visual presentation of target nouns, such as "boat," and varied the combinatorial operations induced by its surrounding context. Nouns in minimal compositional contexts ("red boat") were compared with those appearing in matched noncompositional contexts, such as after an unpronounceable consonant string ("xkq boat") or within a list ("cup, boat"). Source analysis did not implicate traditional language areas (inferior frontal gyrus, posterior temporal regions) in such basic composition. Instead, we found increased combinatorial-related activity in the left anterior temporal lobe (LATL) and ventromedial prefrontal cortex (vmPFC). These regions have been linked previously to syntactic (LATL) and semantic (vmPFC) combinatorial processing in more complex linguistic contexts. Thus, we suggest that these regions play a role in basic syntactic and semantic composition, respectively. Importantly, the temporal ordering of the effects, in which LATL activity (ϳ225 ms) precedes vmPFC activity (ϳ400 ms), is consistent with many processing models that posit syntactic composition before semantic composition during the construction of linguistic representations.

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Visual Feature and Conjunction Searches of Equal Difficulty Engage Only Partially Overlapping Frontoparietal Networks

Cited by 164 publications

References 46 publications

Intrinsic Network Connectivity Reflects Consistency of Synesthetic Experiences

Intrinsic Network Connectivity Reflects Consistency of Synesthetic Experiences

Prioritizing new over old: An fMRI study of the preview search task

Simple Composition: A Magnetoencephalography Investigation into the Comprehension of Minimal Linguistic Phrases

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