Brain activity related to integrative processes in visual object recognition

bottom-up integration and the modulatory influence of stored knowledge

Christian Gerlach, C T Aaside, G W Humphreys, A Gade, O B Paulson, I Law

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

We report evidence from a PET activation study that the inferior occipital gyri (likely to include area V2) and the posterior parts of the fusiform and inferior temporal gyri are involved in the integration of visual elements into perceptual wholes (single objects). Of these areas, the fusiform and inferior temporal gyri were more activated by tasks with recognizable stimuli than by tasks with unrecognizable stimuli. We propose that the posterior parts of the fusiform and inferior temporal gyri, compared with the inferior occipital gyri, are involved in higher level integration, due to the involvement of re-entrant activation from stored structural knowledge. Evidence in favor of this interpretation comes from the additional finding that activation of the anterior part of the left fusiform gyrus and a more anterior part of the right inferior temporal gyrus, areas previously associated with access to stored structural knowledge, was found with recognizable stimuli, but not with unrecognizable stimuli. This latter finding also indicates: (i) that subjects may not refrain from (automatically) identifying objects even if they only have to attend to the objects' global shape, and (ii) that perceptual and memorial processes can be dissociated on both functional and anatomical grounds. No evidence was obtained for the involvement of the parietal lobes in the integration of single objects.

OriginalsprogEngelsk
TidsskriftNeuropsychologia
Vol/bind40
Udgave nummer8
Sider (fra-til)1254-67
Antal sider14
ISSN0028-3932
StatusUdgivet - 2002

Citer dette

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title = "Brain activity related to integrative processes in visual object recognition: bottom-up integration and the modulatory influence of stored knowledge",
abstract = "We report evidence from a PET activation study that the inferior occipital gyri (likely to include area V2) and the posterior parts of the fusiform and inferior temporal gyri are involved in the integration of visual elements into perceptual wholes (single objects). Of these areas, the fusiform and inferior temporal gyri were more activated by tasks with recognizable stimuli than by tasks with unrecognizable stimuli. We propose that the posterior parts of the fusiform and inferior temporal gyri, compared with the inferior occipital gyri, are involved in higher level integration, due to the involvement of re-entrant activation from stored structural knowledge. Evidence in favor of this interpretation comes from the additional finding that activation of the anterior part of the left fusiform gyrus and a more anterior part of the right inferior temporal gyrus, areas previously associated with access to stored structural knowledge, was found with recognizable stimuli, but not with unrecognizable stimuli. This latter finding also indicates: (i) that subjects may not refrain from (automatically) identifying objects even if they only have to attend to the objects' global shape, and (ii) that perceptual and memorial processes can be dissociated on both functional and anatomical grounds. No evidence was obtained for the involvement of the parietal lobes in the integration of single objects.",
keywords = "Adult, Attention, Brain Mapping, Discrimination Learning, Female, Humans, Magnetic Resonance Imaging, Male, Mental Recall, Occipital Lobe, Parietal Lobe, Pattern Recognition, Visual, Perceptual Closure, Reference Values, Temporal Lobe, Tomography, Emission-Computed",
author = "Christian Gerlach and Aaside, {C T} and Humphreys, {G W} and A Gade and Paulson, {O B} and I Law",
year = "2002",
language = "English",
volume = "40",
pages = "1254--67",
journal = "Neuropsychologia",
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Brain activity related to integrative processes in visual object recognition : bottom-up integration and the modulatory influence of stored knowledge. / Gerlach, Christian; Aaside, C T; Humphreys, G W; Gade, A; Paulson, O B; Law, I.

I: Neuropsychologia, Bind 40, Nr. 8, 2002, s. 1254-67.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Brain activity related to integrative processes in visual object recognition

T2 - bottom-up integration and the modulatory influence of stored knowledge

AU - Gerlach, Christian

AU - Aaside, C T

AU - Humphreys, G W

AU - Gade, A

AU - Paulson, O B

AU - Law, I

PY - 2002

Y1 - 2002

N2 - We report evidence from a PET activation study that the inferior occipital gyri (likely to include area V2) and the posterior parts of the fusiform and inferior temporal gyri are involved in the integration of visual elements into perceptual wholes (single objects). Of these areas, the fusiform and inferior temporal gyri were more activated by tasks with recognizable stimuli than by tasks with unrecognizable stimuli. We propose that the posterior parts of the fusiform and inferior temporal gyri, compared with the inferior occipital gyri, are involved in higher level integration, due to the involvement of re-entrant activation from stored structural knowledge. Evidence in favor of this interpretation comes from the additional finding that activation of the anterior part of the left fusiform gyrus and a more anterior part of the right inferior temporal gyrus, areas previously associated with access to stored structural knowledge, was found with recognizable stimuli, but not with unrecognizable stimuli. This latter finding also indicates: (i) that subjects may not refrain from (automatically) identifying objects even if they only have to attend to the objects' global shape, and (ii) that perceptual and memorial processes can be dissociated on both functional and anatomical grounds. No evidence was obtained for the involvement of the parietal lobes in the integration of single objects.

AB - We report evidence from a PET activation study that the inferior occipital gyri (likely to include area V2) and the posterior parts of the fusiform and inferior temporal gyri are involved in the integration of visual elements into perceptual wholes (single objects). Of these areas, the fusiform and inferior temporal gyri were more activated by tasks with recognizable stimuli than by tasks with unrecognizable stimuli. We propose that the posterior parts of the fusiform and inferior temporal gyri, compared with the inferior occipital gyri, are involved in higher level integration, due to the involvement of re-entrant activation from stored structural knowledge. Evidence in favor of this interpretation comes from the additional finding that activation of the anterior part of the left fusiform gyrus and a more anterior part of the right inferior temporal gyrus, areas previously associated with access to stored structural knowledge, was found with recognizable stimuli, but not with unrecognizable stimuli. This latter finding also indicates: (i) that subjects may not refrain from (automatically) identifying objects even if they only have to attend to the objects' global shape, and (ii) that perceptual and memorial processes can be dissociated on both functional and anatomical grounds. No evidence was obtained for the involvement of the parietal lobes in the integration of single objects.

KW - Adult

KW - Attention

KW - Brain Mapping

KW - Discrimination Learning

KW - Female

KW - Humans

KW - Magnetic Resonance Imaging

KW - Male

KW - Mental Recall

KW - Occipital Lobe

KW - Parietal Lobe

KW - Pattern Recognition, Visual

KW - Perceptual Closure

KW - Reference Values

KW - Temporal Lobe

KW - Tomography, Emission-Computed

M3 - Journal article

VL - 40

SP - 1254

EP - 1267

JO - Neuropsychologia

JF - Neuropsychologia

SN - 0028-3932

IS - 8

ER -