Publication

Transcranial magnetic stimulation (TMS) of early visual but not frontal cortices reveals a feature memory of substantial duration

2008
Talks

Abstract

Objective: How the brain achieves integration of temporally dispersed information is one of the enigmas in the neurosciences. By combining feature fusion with transcranial magnetic stimulation (TMS), we show that individual visual features are stored for several hundred milliseconds before being condensed into a conscious percept. Methods: We presented two verniers with opposite offset directions in rapid succession at the same retinotopic location. Because of the short durations (30ms each) only one fused vernier is perceived. The perceived offset of the fused vernier is a combination of the offsets of the two verniers which themselves are consciously not accessible. We then applied TMS at different times after the onset of the first vernier over the occipital or frontal cortex. Six healthy paid subjects contributed with 120 trials per condition each to the study. Results: When TMS was applied occipitally from 45ms to 95ms after the onset of the first vernier, the second vernier dominated significantly (p

Official source

https://infoscience.epfl.ch/entities/publication/057c133e-8fc5-4ab8-97a9-a07d83b3a107

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2008
Talks

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/057c133e-8fc5-4ab8-97a9-a07d83b3a107

About this result

Related concepts (32)

Visual cortex

The visual cortex of the brain is the area of the cerebral cortex that processes visual information. It is located in the occipital lobe. Sensory input originating from the eyes travels through the lateral geniculate nucleus in the thalamus and then reaches the visual cortex. The area of the visual cortex that receives the sensory input from the lateral geniculate nucleus is the primary visual cortex, also known as visual area 1 (V1), Brodmann area 17, or the striate cortex.

Cerebral cortex

The cerebral cortex, also known as the cerebral mantle, is the outer layer of neural tissue of the cerebrum of the brain in humans and other mammals. The cerebral cortex mostly consists of the six-layered neocortex, with just 10% consisting of allocortex. It is separated into two cortices, by the longitudinal fissure that divides the cerebrum into the left and right cerebral hemispheres. The two hemispheres are joined beneath the cortex by the corpus callosum. The cerebral cortex is the largest site of neural integration in the central nervous system.

Visual system

The visual system comprises the sensory organ (the eye) and parts of the central nervous system (the retina containing photoreceptor cells, the optic nerve, the optic tract and the visual cortex) which gives organisms the sense of sight (the ability to detect and process visible light) as well as enabling the formation of several non-image photo response functions. It detects and interprets information from the optical spectrum perceptible to that species to "build a representation" of the surrounding environment.

Related publications (32)

Transcranial magnetic stimulation (TMS) of early visual but not frontal cortices reveals a feature memory of substantial duration

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