Orienting attention to semantic categories

Cristescu, Tamara; Devlin, Joseph T.; Nobre, Anna C.

doi:10.1016/j.neuroimage.2006.08.017

Cited by 75 publications

(74 citation statements)

References 60 publications

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“…For example, Egner et al (2008) manipulated the validity of cues in a cue-target paradigm and found that more informative cues evoked higher activity in fronto-parietal regions, not only when cues informed about a future location, but also when they informed about a specific visual feature of the tobe presented item. Similarly, Cristescu et al (2006) studied responses to cues that predicted either the semantic category of a to-be-presented word or its spatial location, and the authors identified a similar network to that reported by Egner et al (2008), with greater activity for diagnostic cues. M A N U S C R I P T…”

Section: Introductionmentioning

confidence: 81%

Predictability of what or where reduces brain activity, but a bottleneck occurs when both are predictable

Davis

Hasson

2018

NeuroImage

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Detecting regularities in the sensory environment licenses predictions that enable adaptive behaviour. However, it is unclear whether predictions about object category, location, or both dimensions are mediated by overlapping systems, and relatedly, whether constructing predictions about both category and location is associated with processing bottlenecks. To examine this issue, in an fMRI study, we presented participants with image-series in which non-deterministic transition probabilities enabled predictions about either the location of the next image, its semantic category, both dimensions, or neither (the latter forming a "no-regularity" random baseline condition). Speaking to a common system, all three predictable conditions resulted in reduced BOLD activity in four clusters: left rostral anterior cingulate cortex; bilateral putamen, caudate and thalamus; right precentral gyrus, and left visual cortex. Pointing to a processing bottleneck, in some regions, a significant interaction between the two factors was found whereby category-predictable series were associated with lower activity -but only when location regularity was absent. Finally, category regularity decreased activation in areas of the ventral visual stream and semantic areas of lateral temporal cortex, and location regularity decreased activation in a dorsal fronto-parietal cluster, long implicated in the endogenous control of spatial attention. Our findings confirm and expand a role for dACC/dmPFC and striatum in monitoring or responding to uncertainty in the environment and point to a limited capacity bottleneck when multiple predictions are concurrently licensed.

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Section: Introductionmentioning

confidence: 81%

Predictability of what or where reduces brain activity, but a bottleneck occurs when both are predictable

Davis

Hasson

2018

NeuroImage

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“…The engagement of this frontal-parietal oculomotor network in orienting, together with other task-appropriate areas, has been observed in a variety of spatial and nonspatial orienting tasks, including orienting to semantic categories (Cristescu et al, 2006) and to scenes in long-term (Summerfield et al, 2006) or working memory (Lepsien et al, 2005). The activations in each task com- Figure 3.…”

Section: Shared and Task-biased Activity In The Cortexmentioning

confidence: 99%

The Cerebellum Predicts the Timing of Perceptual Events

O’Reilly¹,

Mesulam²,

Nobre³

2008

J. Neurosci.

249

212

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Prospective (forward) temporal-spatial models are essential for both action and perception, but the literature on perceptual prediction has primarily been limited to the spatial domain. In this study we asked how the neural systems of perceptual prediction change, when change-over-time must be modeled. We used a naturalistic paradigm in which observers had to extrapolate the trajectory of an occluded moving object to make perceptual judgments based on the spatial (direction) or temporal-spatial (velocity) characteristics of object motion. Using functional magnetic resonance imaging we found that a region in posterior cerebellum (lobule VII crus 1) was engaged specifically when a temporal-spatial model was required (velocity judgment task), suggesting that circuitry involved in motor forwardmodeling may also be engaged in perceptual prediction when a model of change-over-time is required. This cerebellar region appears to supply a temporal signal to cortical networks involved in spatial orienting: a frontal-parietal network associated with attentional orienting was engaged in both (spatial and temporal-spatial) tasks, but functional connectivity between these regions and the posterior cerebellum was enhanced in the temporal-spatial prediction task. In addition to the oculomotor spatial orienting network, regions involved in hand movements (aIP and PMv) were recruited in the temporal-spatial task, suggesting that the nature of perceptual prediction may bias the recruitment of sensory-motor networks in orienting. Finally, in temporal-spatial prediction, functional connectivity was enhanced between the cerebellum and the putamen, a structure which has been proposed to supply the brain's metric of time, in the temporal-spatial prediction task.

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“…There are some consistencies in the localization of such hemodynamic response enhancement reported in semantic priming paradigms: for example, several studies have reported response enhancement within parietal cortices (BAs 40 and 7) (Kotz, et al 2002;Raposo, et al 2006;Rossell, et al 2003;Wible, et al 2006). This is interesting because such regions constitute part of an attentional circuitry (Behrmann, et al 2004;Chein, et al 2003;Cristescu, et al 2006) that may be specifically engaged as participants attempt to match semantic associations and common semantic features between prime and target after both have been recognized.…”

Section: Implicit Semantic Processingmentioning

confidence: 99%

“…Indeed, there is evidence that some of these functions may be related. For example, in addition to its known role in spatial attention (Corbetta and Shulman 2002), the left parietal cortex is recruited when participants are specifically cued to attend to semantic attributes of a word target (Cristescu, et al 2006). …”

Section: Hemodynamic Response Enhancementmentioning

confidence: 99%

Task and semantic relationship influence both the polarity and localization of hemodynamic modulation during lexico‐semantic processing

Kuperberg

Lakshmanan

Greve

et al. 2007

Human Brain Mapping

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This study examined how task (implicit versus explicit) and semantic relationship (direct versus indirect) modulated hemodynamic activity during lexico-semantic processing. Participants viewed directly related, indirectly related and unrelated prime-target word-pairs as they performed (a) an implicit Lexical Decision (LD) task in which they decided whether each target was a real word or a nonword, and (b) an explicit Relatedness Judgment (RJ) task in which they determined whether each word-pair was related or unrelated in meaning. Task influenced both the polarity and neuroanatomical localization of hemodynamic modulation. Semantic relationship influenced the neuroanatomical localization of hemodynamic modulation. The implicit LD task was primarily associated with inferior prefrontal and ventral inferior temporal/fusiform hemodynamic response suppression to directly related (relative to unrelated) word-pairs, and with more widespread temporal-occipital response suppression to indirectly related (relative to unrelated) word-pairs. In contrast, the explicit RJ task was primarily associated with left inferior parietal hemodynamic response enhancement to both directly and indirectly related (relative to unrelated) word-pairs, as well as with left inferior prefrontal hemodynamic response enhancement to indirectly related (relative to unrelated) word-pairs. These findings are discussed in relation to the specific neurocognitive processes thought to underlie implicit and explicit semantic processes.

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Orienting attention to semantic categories

Cited by 75 publications

References 60 publications

Predictability of what or where reduces brain activity, but a bottleneck occurs when both are predictable

Predictability of what or where reduces brain activity, but a bottleneck occurs when both are predictable

The Cerebellum Predicts the Timing of Perceptual Events

Task and semantic relationship influence both the polarity and localization of hemodynamic modulation during lexico‐semantic processing

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