Anatomy and time course of discrimination and categorization processes in vision: an fMRI study

Pernet, Cyril; Franceries, X.; Basan, Sébastien; Cassol, Edana; Démonet, Jean‐François; Celsis, Pierre

doi:10.1016/j.neuroimage.2004.03.044

Cited by 34 publications

(24 citation statements)

References 49 publications

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“…Engagement of this region in visual object processing has been reported frequently in previous studies (Gerlach et al, 1999;Koutstaal et al, 2001;Lerner et al, 2001;Pernet et al, 2004). It is also consistent with the observed lack of a significant difference in activation during the I period across the three conditions.…”

Section: Activation Characterizing the Perception Stagesupporting

confidence: 91%

“…Based on the classic two-stage model, neuroimaging studies using positron emission tomography (PET) or functional magnetic resonance imaging (fMRI) have addressed the candidate neural substrates involved in these stages and have added some aspects to the model (Gerlach et al, 1999(Gerlach et al, , 2000(Gerlach et al, , 2002Op de Beeck et al, 2000;Pernet et al, 2004). Although the occipitotemporal regions are considered to play important roles in visual object processing, their detailed roles and the order of the processing sequence remain unclear.…”

Section: Introductionmentioning

confidence: 99%

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Neuronal substrates characterizing two stages in visual object recognition

Taminato

Miura

Sugiura

et al. 2014

Neuroscience Research

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Visual object recognition is classically believed to involve two stages: a perception stage in which perceptual information is integrated, and a memory stage in which perceptual information is matched with an object's representation. The transition from the perception to the memory stage can be slowed to allow for neuroanatomical segregation using a degraded visual stimuli (DVS) task in which images are first presented at low spatial resolution and then gradually sharpened. In this functional magnetic resonance imaging study, we characterized these two stages using a DVS task based on the classic model. To separate periods that are assumed to dominate the perception, memory, and post-recognition stages, subjects responded once when they could guess the identity of the object in the image and a second time when they were certain of the identity. Activation of the right medial occipitotemporal region and the posterior part of the rostral medial frontal cortex was found to be characteristic of the perception and memory stages, respectively. Although the known role of the former region in perceptual integration was consistent with the classic model, a likely role of the latter region in monitoring for confirmation of recognition suggests the advantage of recently proposed interactive models.

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Section: Activation Characterizing the Perception Stagesupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Neuronal substrates characterizing two stages in visual object recognition

Taminato

Miura

Sugiura

et al. 2014

Neuroscience Research

View full text Add to dashboard Cite

show abstract

“…However, task-related differences in BOLD latency within the same ROI are likely reflective of differences in the underlying neuronal activity (Formisano and Goebel, 2003;Pernet et al, 2004). In this regard, the delay to peak for emotional relative to neutral stimuli in the CeM AG is likely due to emotion-specific changes in neuronal activity.…”

Section: Differential Engagement Of the Amygdala Subnuclei Groups In mentioning

confidence: 99%

Amygdala subnuclei response and connectivity during emotional processing

Hrybouski

Aghamohammadi‐Sereshki

Madan

et al. 2016

NeuroImage

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The involvement of the human amygdala in emotion-related processing has been studied using functional magnetic resonance imaging (fMRI) for many years. However, despite the amygdala being comprised of several subnuclei, most studies investigated the role of the entire amygdala in processing of emotions. Here we combined a novel anatomical tracing protocol with eventrelated high-resolution fMRI acquisition to study the responsiveness of the amygdala subnuclei to negative emotional stimuli and to examine intra-amygdala functional connectivity. The greatest sensitivity to negative emotional stimuli was observed in the centromedial amygdala, where the hemodynamic response amplitude elicited by negative emotional stimuli was greater and peaked later than for neutral stimuli. Connectivity patterns converge with extant findings in animals, such that the strongest connectivity was between the lateral nucleus and the nuclei of the basal amygdala. Current findings provide evidence of functional specialization within the human amygdala.

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“…For each subject, we contrasted dual-target trials with single-target trials (collapsed across SOAs) and identified in left middle occipital gyrus (LMOG; BA 18 and BA 19) the voxel that showed peak sensitivity (dual > single, Z > 1). We focused on the LMOG, as this region corresponds to the source of attenuated T2 attention-related signal identified by Sergent et al (2005) and is specifically activated by letter discrimination tasks (Pernet et al, 2004). To avoid the selection of deactivated voxels that may surround the site of activation in visual cortex (e.g., Hein, Alink, Kleinschmidt, & Müller, 2009;Bressler, Spotswood, & Whitney, 2007), we selected only voxels that demonstrated positive activation across conditions (Zs > 0).…”

Section: F Mri Data Analysismentioning

confidence: 99%