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Age-Related Differences in Spatial Frequency Processing during Scene Categorization.

Ramanoël S, Kauffmann L, Cousin E, Dojat M, Peyrin C - PLoS ONE (2015)

Bottom Line: Behavioral results revealed performance degradation for elderly participants only when categorizing HSF scenes.Elderly participants showed activation only in the anterior part of the occipital lobe for LSF scenes (compared to HSF), but not significant activation for HSF (compared to LSF).Activation of temporo-parietal regions was greater in elderly participants irrespective of spatial frequencies.

View Article: PubMed Central - PubMed

Affiliation: Univ. Grenoble Alpes, LPNC, F-38000 Grenoble, France; CNRS, LPNC, F-38000 Grenoble, France; Univ. Grenoble Alpes, GIN, F-38000 Grenoble, France.

ABSTRACT
Visual analysis of real-life scenes starts with the parallel extraction of different visual elementary features at different spatial frequencies. The global shape of the scene is mainly contained in low spatial frequencies (LSF), and the edges and borders of objects are mainly contained in high spatial frequencies (HSF). The present fMRI study investigates the effect of age on the spatial frequency processing in scenes. Young and elderly participants performed a categorization task (indoor vs. outdoor) on LSF and HSF scenes. Behavioral results revealed performance degradation for elderly participants only when categorizing HSF scenes. At the cortical level, young participants exhibited retinotopic organization of spatial frequency processing, characterized by medial activation in the anterior part of the occipital lobe for LSF scenes (compared to HSF), and the lateral activation in the posterior part of the occipital lobe for HSF scenes (compared to LSF). Elderly participants showed activation only in the anterior part of the occipital lobe for LSF scenes (compared to HSF), but not significant activation for HSF (compared to LSF). Furthermore, a ROI analysis revealed that the parahippocampal place area, a scene-selective region, was less activated for HSF than LSF for elderly participants only. Comparison between groups revealed greater activation of the right inferior occipital gyrus in young participants than in elderly participants for HSF. Activation of temporo-parietal regions was greater in elderly participants irrespective of spatial frequencies. The present findings indicate a specific low-contrasted HSF deficit for normal elderly people, in association with an occipito-temporal cortex dysfunction, and a functional reorganization of the categorization of filtered scenes.

No MeSH data available.


Cerebral regions activated by contrasting natural scenes filtered in LSF and HSF to fixation periods, and to each other in young and elderly participants.A retinotopic organization for spatial frequency processing was observed in young participants: medial activation of the anterior part of the cuneus for LSF (red circles), extending to the retrosplenial cortex (blue circles), and more lateral activation of the posterior part of the cuneus for HFS (green circles). In elderly participants, LSF scene categorization elicited bilateral activation of the retrosplenial (blue circles) cortex, extending to the anterior part of the cuneus (red circles). For illustrative purposes, statistical maps were generated with P < .0001 uncorrected.
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pone.0134554.g003: Cerebral regions activated by contrasting natural scenes filtered in LSF and HSF to fixation periods, and to each other in young and elderly participants.A retinotopic organization for spatial frequency processing was observed in young participants: medial activation of the anterior part of the cuneus for LSF (red circles), extending to the retrosplenial cortex (blue circles), and more lateral activation of the posterior part of the cuneus for HFS (green circles). In elderly participants, LSF scene categorization elicited bilateral activation of the retrosplenial (blue circles) cortex, extending to the anterior part of the cuneus (red circles). For illustrative purposes, statistical maps were generated with P < .0001 uncorrected.

Mentions: Results for the within-group analysis are shown in Table 2 and Fig 3. We began by contrasting the processing of natural scenes filtered in LSF to HSF ([LSF > HSF] contrast) by young participants, and observed extensive bilateral recruitment of the occipital cortex (in the cuneus), the posterior cingulate gyrus (involving the retrosplenial cortex in the right hemisphere), the left middle temporal gyrus, the left superior and inferior parietal lobule areas, and the right postcentral gyrus. The opposite contrast ([HSF > LSF] contrast) showed that HSF scenes activated the occipital cortex bilaterally and the left inferior temporal gyrus. Critically, in the occipital cortex, results showed that LSF processing specifically activated the medial aspect of the occipital lobe, in the anterior half of the calcarine fissures (peak coordinates: 0x, -69y, 27z; Fig 3 and Table 2A). The reverse [HSF > LSF] contrast elicited significant, rather more posterior bilateral activation in the cuneus (right hemisphere: 20x, -82y, -7z; left hemisphere: -22x, -89y, 4z; Fig 3 and Table 2A). It should be noted that in the right hemisphere, the activation overlapped with the one associated with the interaction between groups and spatial frequencies. Contrasts relative to NF scenes revealed no significant activation.


Age-Related Differences in Spatial Frequency Processing during Scene Categorization.

Ramanoël S, Kauffmann L, Cousin E, Dojat M, Peyrin C - PLoS ONE (2015)

Cerebral regions activated by contrasting natural scenes filtered in LSF and HSF to fixation periods, and to each other in young and elderly participants.A retinotopic organization for spatial frequency processing was observed in young participants: medial activation of the anterior part of the cuneus for LSF (red circles), extending to the retrosplenial cortex (blue circles), and more lateral activation of the posterior part of the cuneus for HFS (green circles). In elderly participants, LSF scene categorization elicited bilateral activation of the retrosplenial (blue circles) cortex, extending to the anterior part of the cuneus (red circles). For illustrative purposes, statistical maps were generated with P < .0001 uncorrected.
© Copyright Policy
Related In: Results  -  Collection

License
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getmorefigures.php?uid=PMC4543582&req=5

pone.0134554.g003: Cerebral regions activated by contrasting natural scenes filtered in LSF and HSF to fixation periods, and to each other in young and elderly participants.A retinotopic organization for spatial frequency processing was observed in young participants: medial activation of the anterior part of the cuneus for LSF (red circles), extending to the retrosplenial cortex (blue circles), and more lateral activation of the posterior part of the cuneus for HFS (green circles). In elderly participants, LSF scene categorization elicited bilateral activation of the retrosplenial (blue circles) cortex, extending to the anterior part of the cuneus (red circles). For illustrative purposes, statistical maps were generated with P < .0001 uncorrected.
Mentions: Results for the within-group analysis are shown in Table 2 and Fig 3. We began by contrasting the processing of natural scenes filtered in LSF to HSF ([LSF > HSF] contrast) by young participants, and observed extensive bilateral recruitment of the occipital cortex (in the cuneus), the posterior cingulate gyrus (involving the retrosplenial cortex in the right hemisphere), the left middle temporal gyrus, the left superior and inferior parietal lobule areas, and the right postcentral gyrus. The opposite contrast ([HSF > LSF] contrast) showed that HSF scenes activated the occipital cortex bilaterally and the left inferior temporal gyrus. Critically, in the occipital cortex, results showed that LSF processing specifically activated the medial aspect of the occipital lobe, in the anterior half of the calcarine fissures (peak coordinates: 0x, -69y, 27z; Fig 3 and Table 2A). The reverse [HSF > LSF] contrast elicited significant, rather more posterior bilateral activation in the cuneus (right hemisphere: 20x, -82y, -7z; left hemisphere: -22x, -89y, 4z; Fig 3 and Table 2A). It should be noted that in the right hemisphere, the activation overlapped with the one associated with the interaction between groups and spatial frequencies. Contrasts relative to NF scenes revealed no significant activation.

Bottom Line: Behavioral results revealed performance degradation for elderly participants only when categorizing HSF scenes.Elderly participants showed activation only in the anterior part of the occipital lobe for LSF scenes (compared to HSF), but not significant activation for HSF (compared to LSF).Activation of temporo-parietal regions was greater in elderly participants irrespective of spatial frequencies.

View Article: PubMed Central - PubMed

Affiliation: Univ. Grenoble Alpes, LPNC, F-38000 Grenoble, France; CNRS, LPNC, F-38000 Grenoble, France; Univ. Grenoble Alpes, GIN, F-38000 Grenoble, France.

ABSTRACT
Visual analysis of real-life scenes starts with the parallel extraction of different visual elementary features at different spatial frequencies. The global shape of the scene is mainly contained in low spatial frequencies (LSF), and the edges and borders of objects are mainly contained in high spatial frequencies (HSF). The present fMRI study investigates the effect of age on the spatial frequency processing in scenes. Young and elderly participants performed a categorization task (indoor vs. outdoor) on LSF and HSF scenes. Behavioral results revealed performance degradation for elderly participants only when categorizing HSF scenes. At the cortical level, young participants exhibited retinotopic organization of spatial frequency processing, characterized by medial activation in the anterior part of the occipital lobe for LSF scenes (compared to HSF), and the lateral activation in the posterior part of the occipital lobe for HSF scenes (compared to LSF). Elderly participants showed activation only in the anterior part of the occipital lobe for LSF scenes (compared to HSF), but not significant activation for HSF (compared to LSF). Furthermore, a ROI analysis revealed that the parahippocampal place area, a scene-selective region, was less activated for HSF than LSF for elderly participants only. Comparison between groups revealed greater activation of the right inferior occipital gyrus in young participants than in elderly participants for HSF. Activation of temporo-parietal regions was greater in elderly participants irrespective of spatial frequencies. The present findings indicate a specific low-contrasted HSF deficit for normal elderly people, in association with an occipito-temporal cortex dysfunction, and a functional reorganization of the categorization of filtered scenes.

No MeSH data available.