Motive Phosphenes
Motive Phosphenes - Related Videos
12:38
State-Dependency Effects on TMS: A Look at Motive Phosphene Behavior
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Cited by 4 •
2010
In this article, we examine the effects of visually relevant state dependency on TMS induced motive phosphenic presentations.
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DC Motors
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2023
Source: Ali Bazzi, Department of Electrical Engineering, University of Connecticut, Storrs, CT. The DC machine operates with DC currents and voltages as opposed to an AC machine, which requires AC currents and voltages. DC machines were the first to be invented and utilize two magnetic fields that are controlled by DC currents. The same machine can be easily reconfigured to be a motor or generator if appropriate field excitation is available, since the DC machine has two fields termed field...
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Motor Maps
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2023
Source: Laboratories of Jonas T. Kaplan and Sarah I. Gimbel—University of Southern California One principle of brain organization is the topographic mapping of information. Especially in sensory and motor cortices, adjacent regions of the brain tend to represent information from adjacent parts of the body, resulting in maps of the body expressed on the surface of the brain. The primary sensory and motor maps in the brain surround a prominent sulcus known as the central sulcus. The cortex...
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Motor Exam II
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2023
Source:Tracey A. Milligan, MD; Tamara B. Kaplan, MD; Neurology, Brigham and Women's/Massachusetts General Hospital, Boston, Massachusetts, USA There are two main types of reflexes that are tested on a neurological examination: stretch (or deep tendon reflexes) and superficial reflexes. A deep tendon reflex (DTR) results from the stimulation of a stretch-sensitive afferent from a neuromuscular spindle, which, via a single synapse, stimulates a motor nerve leading to a muscle contraction. DTRs...
08:45
An Introduction to Motor Control
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2023
Motor control involves integration and processing of sensory information by our nervous system, followed by a response through our skeletal system to perform a voluntary or involuntary action. It is vital to understand how our neuroskeletal system controls motor behavior in order to evaluate injuries pertaining to general movement, reflexes, and coordination. An improved understanding of motor control will help behavioral neuroscientists in developing useful tools to treat motor disorders, such...
FAQs
Mechanical deformation of the retina is the key initiating event in motive phosphenes. Eye movement can stimulate retinal neurons even when no external light signal is available, and those cells then transmit activity through visual pathways. The resulting neural activity helps explain why a physical change at the retina can be experienced as an organized visual event rather than as simple eye motion.
Eye movement matters because it links the physical trigger to the reported visual experience. When the eye moves, retinal stimulation can occur without a corresponding change in incoming light. This association gives investigators a way to examine how motion-related retinal activity is transformed into perception, while keeping the source of the signal distinct from an external visual stimulus.
These sensations help separate retinal and cortical contributions to vision. Retinal activation identifies an early, eye-based source of the signal, whereas the experienced flash or pattern reflects activity interpreted through visual pathways. Comparing those levels allows neuroscience research to ask how signals originating in the retina become perceived visual content.
Researchers can study motive phosphenes by relating eye movement to reported visual sensations. The central observation is whether a movement-linked event occurs despite the absence of light entering the eye. This approach provides a functional window into retinal responsiveness and the transmission of activity through visual pathways, without treating an external image as the initiating stimulus.
Because the visual experience is generated internally, motive phosphenes offer a way to examine how neural activity is encoded as flashes, patterns, or streaks. The sensations connect a physical retinal event with a perceptual outcome, helping investigators study how visual pathways represent signals and how those representations relate to what a person experiences.
Research on motive phosphenes can inform studies of visual disorders by providing a reference for retinal and pathway function. When movement-linked stimulation produces a visual experience, investigators can consider how retinal responsiveness and sensory processing contribute to normal or altered vision. The topic therefore connects basic neuroscience with efforts to understand disturbances in visual experience.