scholarly journals Two Retinotopic Visual Areas in Human Lateral Occipital Cortex

2006 ◽  
Vol 26 (51) ◽  
pp. 13128-13142 ◽  
Author(s):  
J. Larsson ◽  
D. J. Heeger
Keyword(s):  
Occipital Cortex ◽  
Visual Areas ◽  
Lateral Occipital Cortex

Equal Degrees of Object Selectivity for Upper and Lower Visual Field Stimuli

2010 ◽  
Vol 104 (4) ◽  
pp. 2075-2081 ◽  
Author(s):  
Lars Strother ◽  
Adrian Aldcroft ◽  
Cheryl Lavell ◽  
Tutis Vilis
Keyword(s):  
Visual Field ◽  
Occipital Cortex ◽  
Recognition System ◽  
Blood Oxygen Level Dependent ◽  
Lower Visual Field ◽  
Blood Oxygen Level ◽  
Visual Areas ◽  
Bold Responses ◽  
Cortical Regions ◽  
Lateral Occipital Cortex

Functional MRI (fMRI) studies of the human object recognition system commonly identify object-selective cortical regions by comparing blood oxygen level–dependent (BOLD) responses to objects versus those to scrambled objects. Object selectivity distinguishes human lateral occipital cortex (LO) from earlier visual areas. Recent studies suggest that, in addition to being object selective, LO is retinotopically organized; LO represents both object and location information. Although LO responses to objects have been shown to depend on location, it is not known whether responses to scrambled objects vary similarly. This is important because it would suggest that the degree of object selectivity in LO does not vary with retinal stimulus position. We used a conventional functional localizer to identify human visual area LO by comparing BOLD responses to objects versus scrambled objects presented to either the upper (UVF) or lower (LVF) visual field. In agreement with recent findings, we found evidence of position-dependent responses to objects. However, we observed the same degree of position dependence for scrambled objects and thus object selectivity did not differ for UVF and LVF stimuli. We conclude that, in terms of BOLD response, LO discriminates objects from non-objects equally well in either visual field location, despite stronger responses to objects in the LVF.

scholarly journals Intrinsic cortical dynamics dominate population responses to natural images across human visual cortex

2014 ◽  
Author(s):  
Linda Henriksson ◽  
Seyed-Mahdi Khaligh-Razavi ◽  
Kendrick Kay ◽  
Nikolaus Kriegeskorte
Keyword(s):  
Visual Cortex ◽  
Occipital Cortex ◽  
Brain Regions ◽  
Gabor Wavelet ◽  
Natural Image ◽  
Response Patterns ◽  
Cortical Dynamics ◽  
Visual Areas ◽  
Pyramid Model ◽  
Lateral Occipital Cortex

Intrinsic cortical dynamics are thought to underlie trial-to-trial variability of visually evoked responses in animal models. Understanding their function in the context of sensory processing and representation is a major current challenge. Here we report that intrinsic cortical dynamics strongly affect the representational geometry of a brain region, as reflected in response-pattern dissimilarities, and exaggerate the similarity of representations between brain regions. We characterized the representations in several human visual areas by representational dissimilarity matrices (RDMs) constructed from fMRI response-patterns for natural image stimuli. The RDMs of different visual areas were highly similar when the response-patterns were estimated on the basis of the same trials (sharing intrinsic cortical dynamics), and quite distinct when patterns were estimated on the basis of separate trials (sharing only the stimulus-driven component). We show that the greater similarity of the representational geometries can be explained by the coherent fluctuations of regional-mean activation within visual cortex, reflecting intrinsic dynamics. Using separate trials to study stimulus-driven representations revealed clearer distinctions between the representational geometries: a Gabor wavelet pyramid model explained representational geometry in visual areas V1–3 and a categorical animate–inanimate model in the object-responsive lateral occipital cortex.

scholarly journals Theta-burst TMS of lateral occipital cortex reduces BOLD responses across category-selective areas in ventral temporal cortex

NeuroImage ◽  
2021 ◽  
Vol 230 ◽  
pp. 117790
Author(s):  
Iris I A Groen ◽  
Edward H Silson ◽  
David Pitcher ◽  
Chris I Baker
Keyword(s):  
Temporal Cortex ◽  
Occipital Cortex ◽  
Bold Responses ◽  
Ventral Temporal Cortex ◽  
Theta Burst ◽  
Lateral Occipital Cortex

scholarly journals Sensory perception in autism: an fMRI ALE meta-analysis

2020 ◽  
Author(s):  
Nazia Jassim ◽  
Simon Baron-Cohen ◽  
John Suckling
Keyword(s):  
Meta Analysis ◽  
Likelihood Estimation ◽  
Sensory Perception ◽  
Superior Temporal Gyrus ◽  
Occipital Cortex ◽  
Anterior Cingulate ◽  
Future Research ◽  
Precentral Gyrus ◽  
And Control ◽  
Lateral Occipital Cortex

Sensory sensitivities occur in up to 90% of autistic individuals. With the recent inclusion of sensory symptoms in the diagnostic criteria for autism, there is a current need to develop neural hypotheses related to autistic sensory perception. Using activation likelihood estimation (ALE), we meta-analysed 52 task-based fMRI studies investigating differences between autistic (n=891) and control (n=967) participants during non-social sensory perception. During complex perception, autistic groups showed more activity in the secondary somatosensory and occipital cortices, insula, caudate, superior temporal gyrus, and inferior parietal lobule, while control groups showed more activity in the frontal and parietal regions. During basic sensory processing, autistic groups showed hyperactivity in the lateral occipital cortex, primary somatosensory and motor cortices, insula, caudate, and thalamus, while controls showed heightened activity in the precentral gyrus, middle frontal gyrus, precuneus, and anterior cingulate cortex. We conclude that autistic individuals, on average, show distinct engagement of sensory-related brain networks during sensory perception. These findings may help guide future research to focus on relevant neurobiological mechanisms underpinning the autistic experience.

scholarly journals Transcranial magnetic stimulation to lateral occipital cortex disrupts object ensemble processing

2011 ◽  
Vol 11 (11) ◽  
pp. 890-890
Author(s):  
C. Mullin ◽  
J. Steeves
Keyword(s):  
Transcranial Magnetic Stimulation ◽  
Magnetic Stimulation ◽  
Occipital Cortex ◽  
Lateral Occipital Cortex

Context-dependent dynamic functional connectivity alteration of lateral occipital cortex in schizophrenia

2020 ◽  
Vol 220 ◽  
pp. 201-209 ◽  
Author(s):  
Kaiming Li ◽  
John A. Sweeney ◽  
Xiaoping P. Hu
Keyword(s):  
Functional Connectivity ◽  
Occipital Cortex ◽  
Dynamic Functional Connectivity ◽  
Context Dependent ◽  
Lateral Occipital Cortex

scholarly journals Configural specificity of the lateral occipital cortex

2010 ◽  
Vol 48 (11) ◽  
pp. 3323-3328 ◽  
Author(s):  
L.G. Appelbaum ◽  
J.M. Ales ◽  
B. Cottereau ◽  
A.M. Norcia
Keyword(s):  
Occipital Cortex ◽  
Lateral Occipital Cortex

scholarly journals Dynamic Coupling Between the Lateral Occipital-Cortex, Default-Mode, and Frontoparietal Networks During Bistable Perception

2013 ◽  
Vol 3 (3) ◽  
pp. 286-293 ◽  
Author(s):  
Ariel Karten ◽  
Spiro P. Pantazatos ◽  
David Khalil ◽  
Xian Zhang ◽  
Joy Hirsch
Keyword(s):  
Occipital Cortex ◽  
Dynamic Coupling ◽  
Default Mode ◽  
Bistable Perception ◽  
Lateral Occipital Cortex

Anatomy and white matter connections of the lateral occipital cortex

2019 ◽  
Vol 42 (3) ◽  
pp. 315-328 ◽  
Author(s):  
Ali H. Palejwala ◽  
Kyle P. O’Connor ◽  
Panayiotis Pelargos ◽  
Robert G. Briggs ◽  
Camille K. Milton ◽  
...  
Keyword(s):  
White Matter ◽  
Occipital Cortex ◽  
Lateral Occipital Cortex
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