Cerebral regions and hemispheric specialization for processing spatial frequencies during natural scene recognition. An event-related fMRI study

On the Specific Role of the Occipital Cortex in Scene Perception

“…This hemispheric specialization has been observed either through behavioral studies on healthy subjects [21,[37][38][39][40][41][42][43][44][45][46][47][48] and neurological patients [49][50][51], or through functional neuroimaging studies [19,20,[52][53][54][55][56][57][58][59][60][61][62][63][64][65]. However, the hemispheric asymmetries in question were largely inferred from studies assessing hemispheric specialization in global and local processing.…”

“…By directly manipulating the spatial frequency content of stimuli, subsequent studies revealed hemispheric specialization in certain occipito-temporal areas [19,20]. In one fMRI study [20], we investigated the neural correlates and the hemispheric specialization of spatial frequency processing during the perception of scene stimuli which allowed an explicit change in the spatial frequency spectrum. For this purpose, we used a categorization task of small LSF and HSF scene images (at a visual angle of 4°).…”

“…Despite studies showing retinotopic mapping of spatial frequency processing in the occipital cortex, many experimental arguments assume a certain hemispheric specialization of spatial frequency processing in the occipital cortex. The right occipital cortex appears to be preferentially specialized for LSF information processing, while the left occipital cortex seems to be preferentially specialized for HSF information processing [19][20][21]. It is, therefore, essential to determine whether hemispheric specialization and retinotopic processing can co-occur in the occipital cortex.…”

Investigating Semantic Relationship between the Scene and the Sound within the Scene by Dynamic Causal Modeling

“…However, effective connection is directional, it can not only characterize the connection of the regions under the experiment context, but also describe the flow of information among brain regions. Previous studies have revealed two pathways for scene recognition [4][5][6]: the global scene and the object in the scene [7]. The reason for the existence of the latter channel was due to the semantic correlation between the scene and the object within the scene, for example, you can quickly and accurately determine that the scene is the bathroom when you see only the bathtub.…”

Efeitos de bandas de frequência espacial alta e baixa no reconhecimento de faces em campo visual lateralizado

“…A hipótese também preconiza que o HD seria pior para processar as imagens com FEA do que o HE; e o HE seria pior para processar as imagens com FEB do que o HD. Estudos prévios confirmam essa hipótese da FE (PEYRIN, et al, 2004;PEYRIN, et al, 2005 interpretados segundo o predomínio de processamento que tem cada gênero; isto é, as mulheres, por terem uma predominância hemisférica esquerda mais marcada, tendem a ser mais verbais, e têm um processamento mais analítico da informação do que os homens, que fazem um processamento da informação mais holístico, têm predomínio do HD.…”