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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 differentially activated by (a) young and (b) elderly participants during the categorization of low-spatial frequency (LSF) and high-spatial frequency (HSF) scenes.For illustrative purposes, statistical maps were generated with P < .0001 uncorrected.
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pone.0134554.g004: Cerebral regions differentially activated by (a) young and (b) elderly participants during the categorization of low-spatial frequency (LSF) and high-spatial frequency (HSF) scenes.For illustrative purposes, statistical maps were generated with P < .0001 uncorrected.

Mentions: Results for the between-group analysis are shown in Table 3 and Fig 4. The between group analysis revealed greater activation of the right inferior occipital gyrus (peak coordinates: 20x, -82y, -7z) in young participants ([Young > Elderly] contrast) for the categorization of HSF scenes. This activation overlapped with the one associated with the interaction between groups and spatial frequencies. No greater activation was observed for the categorization of LSF and NF scenes. In contrast, greater activation in the left temporal areas (the middle temporal gyrus) and parietal areas bilaterally (the inferior parietal lobules), as well as in the right superior frontal gyrus was observed in elderly participants ([Elderly > Young] contrast) for the categorization of both LSF and HSF scenes. A similar cerebral network was activated during the categorization of HSF, with the exception of the middle temporal gyrus which showed greater activation only in the left hemisphere, the primary motor cortex where activation was greater only in the right hemisphere and the putamen and cerebellum where no significant activation appeared. No greater activation was observed for the categorization of NF scenes.


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 differentially activated by (a) young and (b) elderly participants during the categorization of low-spatial frequency (LSF) and high-spatial frequency (HSF) scenes.For illustrative purposes, statistical maps were generated with P < .0001 uncorrected.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4543582&req=5

pone.0134554.g004: Cerebral regions differentially activated by (a) young and (b) elderly participants during the categorization of low-spatial frequency (LSF) and high-spatial frequency (HSF) scenes.For illustrative purposes, statistical maps were generated with P < .0001 uncorrected.
Mentions: Results for the between-group analysis are shown in Table 3 and Fig 4. The between group analysis revealed greater activation of the right inferior occipital gyrus (peak coordinates: 20x, -82y, -7z) in young participants ([Young > Elderly] contrast) for the categorization of HSF scenes. This activation overlapped with the one associated with the interaction between groups and spatial frequencies. No greater activation was observed for the categorization of LSF and NF scenes. In contrast, greater activation in the left temporal areas (the middle temporal gyrus) and parietal areas bilaterally (the inferior parietal lobules), as well as in the right superior frontal gyrus was observed in elderly participants ([Elderly > Young] contrast) for the categorization of both LSF and HSF scenes. A similar cerebral network was activated during the categorization of HSF, with the exception of the middle temporal gyrus which showed greater activation only in the left hemisphere, the primary motor cortex where activation was greater only in the right hemisphere and the putamen and cerebellum where no significant activation appeared. No greater activation was observed for the categorization of NF scenes.

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.