Results 51 to 60 of about 4,659 (203)
The Pan-American Journal of Ophthalmology, 2019 We report a case of visual alterations after the first use of poppers in a young male patient. A 32-year-old male patient with no past medical history presented with decreased central visual acuity and phosphenes in both eyes.
Renzo Canote Flores, Johana Rueda Rueda
doaj +1 more source
Safety Aspects, Tolerability and Modeling of Retinofugal Alternating Current Stimulation [PDF]
, 2019 Background While alternating current stimulation (ACS) is gaining relevance as a tool in research and approaching clinical applications, its mechanisms of action remain unclear.
Brandt, Stephan A. +8 more
core +2 more sources
Mechanisms of phosphenes in irradiated patients
Oncotarget, 2017 Anomalous visual perceptions have been reported in various diseases of the retina and visual pathways or can be experienced under specific conditions in healthy individuals. Phosphenes are perceptions of light in the absence of ambient light, occurring independently of the physiological and classical photonic stimulation of the retina.
Mathis, Thibaud +9 more
openaire +2 more sources
Inhibition of Return Impairs Phosphene Detection [PDF]
Journal of Cognitive Neuroscience, 2012 Abstract Efficient visual exploration requires the ability to select possible target locations via spatial attention and to deselect previously inspected locations via inhibition of return (IOR). Although a great deal is known about the effects of spatial attention on processing in visual cortex, much less is known about the effects of ...
Daniel T. Smith +2 more
openaire +4 more sources
Frontiers in Human Neuroscience, 2020 Transcranial magnetic stimulation (TMS) of the visual cortex can induce phosphenes as participants look at a visual target. So can non-diagnostic ultrasound (nDU), delivered in a transcranial fashion, while participants have closed their eyes during ...
Nels Schimek +8 more
doaj +1 more source
Accurate and rapid estimation of phosphene thresholds (REPT). [PDF]
PLoS ONE, 2011 To calibrate the intensity of transcranial magnetic stimulation (TMS) at the occipital pole, the phosphene threshold is used as a measure of cortical excitability.
Arman Abrahamyan +5 more
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Neuro-electronic technology in medicine and beyond [PDF]
, 2000 This dissertation looks at the technology and social issues involved with interfacing electronics directly to the human nervous system, in particular the methods for both reading and stimulating nerves.
Ward, Jamie A
core
The speed of parietal theta frequency drives visuospatial working memory capacity [PDF]
, 2018 The speed of theta brain oscillatory activity is thought to play a key role in determining working memory (WM) capacity. Individual differences in the length of a theta cycle (ranging between 4 and 7 Hz) might determine how many gamma cycles (>30 Hz) can
A Antal +44 more
core +4 more sources
Migraine-linked characteristics of transcranial magnetic stimulation-induced phosphenes
Journal of Integrative Neuroscience, 2019 Transcranial magnetic stimulation is used to explore visual cortex hyperexcitability in migraine. We hypothesized that the phosphene threshold in subjects suffering from migraines with and without aura would be lower than in controls, and this phenomenon
Aleksandra Ekkert +3 more
doaj +1 more source
The dynamics of visual experience, an EEG study of subjective pattern formation. [PDF]
PLoS ONE, 2012 BACKGROUND: Since the origin of psychological science a number of studies have reported visual pattern formation in the absence of either physiological stimulation or direct visual-spatial references.
Mark A Elliott +2 more
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