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Early ‘visual’ cortex activation correlates with superior verbal memory performance in the blind
TLDR
Using functional magnetic resonance imaging (fMRI) in ten congenitally blind human participants, robust occipital activation during a verbal-memory task (in the absence of any sensory input), as well as during verb generation and Braille reading is found.
Visuo-haptic object-related activation in the ventral visual pathway
TLDR
Using fMRI to map object-related brain regions, it is suggested that neuronal populations in the occipito–temporal cortex may constitute a multimodal object- related network.
The plastic human brain cortex.
TLDR
The challenge the authors face is to learn enough about the mechanisms of plasticity to modulate them to achieve the best behavioral outcome for a given subject.
Convergence of visual and tactile shape processing in the human lateral occipital complex.
TLDR
It is suggested that LOtv, the cortical region LOtv for the lateral occipital tactile-visual region, is involved in recovering the geometrical shape of objects.
Spontaneous fluctuations in posterior alpha-band EEG activity reflect variability in excitability of human visual areas.
TLDR
The data directly link momentary levels of posterior alpha-band activity to distinct states of visual cortex excitability, and suggest that their spontaneous fluctuation constitutes a visual operation mode that is activated automatically even without retinal input.
Shape conveyed by visual-to-auditory sensory substitution activates the lateral occipital complex
TLDR
The lateral-occipital tactile-visual area is also activated in sighted and blind humans who recognize objects by extracting shape information from visual-to-auditory sensory substitution soundscapes, suggesting that LOtv is driven by the presence of shape information.
Functional imaging of human crossmodal identification and object recognition
TLDR
These studies show that visual, tactile, and auditory information about objects can activate cortical association areas that were once believed to be modality-specific, and propose a general mechanism for crossmodal object recognition.
Extensive Cochleotopic Mapping of Human Auditory Cortical Fields Obtained with Phase-Encoding fMRI
The primary sensory cortices are characterized by a topographical mapping of basic sensory features which is considered to deteriorate in higher-order areas in favor of complex sensory features.
Transcranial magnetic stimulation of the occipital pole interferes with verbal processing in blind subjects
TLDR
It is shown here that repetitive transcranial magnetic stimulation of the occipital pole reduces accuracy on a verb-generation task in blind subjects, but not in sighted controls, and a transient 'virtual lesion' of the left occipitals interferes with high-level verbal processing.
Combined activation and deactivation of visual cortex during tactile sensory processing.
TLDR
Functional magnetic resonance imaging results suggest that tactile processing affects occipital cortex via two distinct pathways: a suppressive top-down pathway descending through the visual cortical hierarchy and an excitatory pathway arising from outside the visual cortex hierarchy that drives area V1 directly.
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