Abstract
The current study aims to investigate visual scene perception and its neuro-anatomical correlates for stimuli presented in the central visual field of patients with homonymous hemianopia, and thereby to assess the effect of a right or a left occipital lesion on brain reorganization. Fourteen healthy participants, three left brain damaged (LBD) patients with right homonymous hemianopia and five right brain damaged (RBD) patients with left homonymous hemianopia performed a visual detection task (i.e. “Is there an image on the screen?”) and a categorization task (i.e. “Is it an image of a highway or a city?”) during a block-designed functional magnetic resonance imaging recording session. Cerebral activity analyses of the posterior areas—the occipital lobe in particular—highlighted bi-hemispheric activation during the detection task but more lateralized, left occipital lobe activation during the categorization task in healthy participants. Conversely, in patients, the same network of activity was observed in both tasks. However, LBD patients showed a predominant activation in their right hemisphere (occipital lobe and posterior temporal areas) whereas RBD patients showed a more bilateral activation (in the occipital lobes). Overall, our preliminary findings suggest a specific pattern of cerebral activation depending on the task instruction in healthy participants and cerebral reorganization of the posterior areas following brain injury in hemianopic patients which could depend upon the side of the occipital lesion.
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Notes
For behavioural data, in healthy controls a significant main spatial frequency effect (F2,26 = 9.61, p < 0.001) as well as a significant spatial frequency x task interaction were observed for ER (F2,26 = 4.31, p < 0.05) revealing a higher ER [6.1 % ± 3.2] when HSF-images were presented (compared to LSF [0.6 % ± 0.1] and UF [0.1 % ± 0.02]–images) in the detection task only (ER in the categorization task: HSF-images = 6.4 % ± 6.2, LSF-images = 5.3 % ± 6.7; UF-images = 5.6 % ± 4.6). For RTs there was a significant spatial frequency effect (F2,26 = 12.05, p < 0.001) highlighting the classic coarse-to-fine time course for spatial frequency processing (i.e., longer RT for HSF than for LSF or UF–images; e.g., Cavézian et al. 2010). However, in each patient, the type of images did not influence ER or RTs. For imaging data, we investigated the specific role of spatial frequency in each task by extracting parameter estimates from the clusters activated within the occipito-temporal and parietal cortices in the detection task (left inferior occipital gyrus, right inferior occipital gyrus, and left superior parietal lobule) and the categorization task (left inferior occipital gyrus, left middle occipital gyrus, and left superior parietal lobule). These values were submitted into separate repeated-measure ANOVAs with Spatial Frequency as within-subjects factors. In healthy controls, only one area showed an activity depending on the spatial frequency in the categorization task. The left middle occipital gyrus showed greater activity when participants have to categorize scenes filtered in HSF than in LSF (F1,13 = 13.05, p < 0.005), while there was no difference between UF and HSF scenes (F1,13 < 1) or between UF and LSF scenes (F1,13 = 2.38, p = 0.15). The specific activation of that area was previously reported in Peyrin et al., 2004. However, in patients, the pattern of activation for spatial frequency was highly variable from one patient to another and seems difficult to interpret.
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This research was supported by the Edmond and Benjamin de Rothschild Foundations (Geneva, Switzerland, & New York, USA).
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Perez, C., Peyrin, C., Cavézian, C. et al. An fMRI Investigation of the Cortical Network Underlying Detection and Categorization Abilities in Hemianopic Patients. Brain Topogr 26, 264–277 (2013). https://doi.org/10.1007/s10548-012-0244-z
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DOI: https://doi.org/10.1007/s10548-012-0244-z