The Visual System: From Eye to Cortex - U
... • We all have a blind spot at the optic disk, due to the exit of axons from the retinal ganglion cells • We are normally unaware of our blind spots, even when looking through one stationary eye because of completion; the visual system is able to use visual information gathered from receptors around ...
... • We all have a blind spot at the optic disk, due to the exit of axons from the retinal ganglion cells • We are normally unaware of our blind spots, even when looking through one stationary eye because of completion; the visual system is able to use visual information gathered from receptors around ...
Mechanisms of Visual Attention in the Human Cortex
... stimuli presented alone. For example, if a single good stimulus elicited a high firing rate and a single poor stimulus elicited a low firing rate, the response to the paired stimuli was reduced compared with that elicited by the single good stimulus. This result indicates that two stimuli present at ...
... stimuli presented alone. For example, if a single good stimulus elicited a high firing rate and a single poor stimulus elicited a low firing rate, the response to the paired stimuli was reduced compared with that elicited by the single good stimulus. This result indicates that two stimuli present at ...
Human Lateral Geniculate Nucleus and Visual Cortex Respond to
... by the screen flicker and is not an electromagnetic artifact. This signal presents the electrophysiological characteristics of the SSVEPs usually evoked by repeated flashed stimuli. Indeed, these oscillations are phase-locked to the periodic stimulus, as they are best observed on the averaged evoked ...
... by the screen flicker and is not an electromagnetic artifact. This signal presents the electrophysiological characteristics of the SSVEPs usually evoked by repeated flashed stimuli. Indeed, these oscillations are phase-locked to the periodic stimulus, as they are best observed on the averaged evoked ...
lgn - cinpla
... The lateral geniculate nucleus (LGN) is placed in a prominent position in the early visual pathway. It sits between the retina and the visual cortex, acting as a relay between the two. Inserting a microelectrode into the LGN reveals that the receptive fields are very similar to those in the retina. ...
... The lateral geniculate nucleus (LGN) is placed in a prominent position in the early visual pathway. It sits between the retina and the visual cortex, acting as a relay between the two. Inserting a microelectrode into the LGN reveals that the receptive fields are very similar to those in the retina. ...
Can neuroscience reveal the true nature of consciousness?
... Response properties of neurons along this hierarchy have mainly been studied using isolated stimuli. But natural scenes typically contain many objects. In that case, competition between these stimuli arises16,17 , such that not all stimuli reach into the highest levels of this hierarchy; only a few ...
... Response properties of neurons along this hierarchy have mainly been studied using isolated stimuli. But natural scenes typically contain many objects. In that case, competition between these stimuli arises16,17 , such that not all stimuli reach into the highest levels of this hierarchy; only a few ...
Paying attention to correlated neural activity
... the effect of attention on neuronal responses. For instance, one could alternate between a coarsediscrimination task in which the monkey is trained to discriminate between 0 and 180 degrees and a fine-discrimination task in which the monkey must discriminate between –3 and +3 degrees (Fig. 1c) ...
... the effect of attention on neuronal responses. For instance, one could alternate between a coarsediscrimination task in which the monkey is trained to discriminate between 0 and 180 degrees and a fine-discrimination task in which the monkey must discriminate between –3 and +3 degrees (Fig. 1c) ...
Sensory modalities are not separate modalities: plasticity and
... Sound-induced illusory flashing. The number of flashes reported by the observers is plotted against the number of beeps that accompanied the visual stimulus, in trials where the visual stimulus comprises only one flash. Observers report seeing two or more flashes, when a single flash is accompanied ...
... Sound-induced illusory flashing. The number of flashes reported by the observers is plotted against the number of beeps that accompanied the visual stimulus, in trials where the visual stimulus comprises only one flash. Observers report seeing two or more flashes, when a single flash is accompanied ...
Synopsis: Overview Perception Retina Central projections LGN
... such as thalamus and superior colliculus, do not receive direct sensory neuron input, but instead receive input from bipolar cells that in turn have synaptic inputs from cone visual receptor cells (Cajal, 1904; Sterling and Demb, 2004) (Figure 2; circuit diagram in Figure 3). Interestingly, while it ...
... such as thalamus and superior colliculus, do not receive direct sensory neuron input, but instead receive input from bipolar cells that in turn have synaptic inputs from cone visual receptor cells (Cajal, 1904; Sterling and Demb, 2004) (Figure 2; circuit diagram in Figure 3). Interestingly, while it ...
ALS for the non-expert - Mass General Hospital
... ALS for the non-expert: Review of the Guidelines for treatment Every Tuesday as I make my way into work I think of the book, “Tuesdays with Morrie.” Tuesday is the day when our hospital holds the ALS Multidisciplinary Clinic, and the patients and families I see in clinic remind me of the courage por ...
... ALS for the non-expert: Review of the Guidelines for treatment Every Tuesday as I make my way into work I think of the book, “Tuesdays with Morrie.” Tuesday is the day when our hospital holds the ALS Multidisciplinary Clinic, and the patients and families I see in clinic remind me of the courage por ...
Brain Sturcture and Function
... navigation (proprioception), the main sensory receptive area for the sense of touch (somatosensation) in the somatosensory cortex which is just posterior to the central sulcus in the post central gyrus, and the dorsal stream of the visual system. The major sensory inputs from the skin (touch, temper ...
... navigation (proprioception), the main sensory receptive area for the sense of touch (somatosensation) in the somatosensory cortex which is just posterior to the central sulcus in the post central gyrus, and the dorsal stream of the visual system. The major sensory inputs from the skin (touch, temper ...
Beneficial effect of repetitive transcranial magnetic stimulation
... of apomorphine-induced stereotypy, a reduction of immobility time in the Porsolt swim test, and an increase in the seizure threshold for subsequent stimulation. They also showed evidence that rTMS led to a reduction in betaadrenergic receptor density in cortical areas, but not in the hippocampus. Lo ...
... of apomorphine-induced stereotypy, a reduction of immobility time in the Porsolt swim test, and an increase in the seizure threshold for subsequent stimulation. They also showed evidence that rTMS led to a reduction in betaadrenergic receptor density in cortical areas, but not in the hippocampus. Lo ...
Perception
... John Locke (1632-1704) argued that we learn to perceive the world through our experiences. How important is experience in shaping our perceptual interpretation? ...
... John Locke (1632-1704) argued that we learn to perceive the world through our experiences. How important is experience in shaping our perceptual interpretation? ...
An ampakine upregulates BDNF and improves memory in the HD
... An ampakine upregulates BDNF and improves memory in the HD knock-in mice Dr. Gary Lynch and colleagues have been researching memory deficits in the HD knockin mouse and investigating whether a class of drugs called ampakines could ameliorate them. In their latest study, an ampakine upregulated BDNF ...
... An ampakine upregulates BDNF and improves memory in the HD knock-in mice Dr. Gary Lynch and colleagues have been researching memory deficits in the HD knockin mouse and investigating whether a class of drugs called ampakines could ameliorate them. In their latest study, an ampakine upregulated BDNF ...
Neurochemistry of Dementias
... Parkinson’s Disease Dementia, edited by Professor Murat Emre Chapter 13 - Neurochemistry of Parkinson’s disease dementia Piggott MA and Perry EK (2010) Early-Onset Dementia, edited by Professor John R Hodges Chapter 9 – Neurochemical pathology in degenerative dementias Elaine Perry, Rose Goodchild a ...
... Parkinson’s Disease Dementia, edited by Professor Murat Emre Chapter 13 - Neurochemistry of Parkinson’s disease dementia Piggott MA and Perry EK (2010) Early-Onset Dementia, edited by Professor John R Hodges Chapter 9 – Neurochemical pathology in degenerative dementias Elaine Perry, Rose Goodchild a ...
Notes on Learning to Compute and Computing to Learn
... sites where multimodal integration actually takes place [10] – these studies were inspired, in part, by the earlier work on cats [21, 22]. Two experiments, one dealing with subjects’ mouth movements whilst looking at a videotape of the lower half of a face silently mouthing ...
... sites where multimodal integration actually takes place [10] – these studies were inspired, in part, by the earlier work on cats [21, 22]. Two experiments, one dealing with subjects’ mouth movements whilst looking at a videotape of the lower half of a face silently mouthing ...
Phineas Gage (Lobes)
... from the visual sensory neurons on the retina and assists the brain in making an image. ...
... from the visual sensory neurons on the retina and assists the brain in making an image. ...
Superior Colliculus and Visual Spatial Attention
... location was cued, for both spatial and symbolic cues. In contrast, “visual-motor” neurons (with both visual and saccade-related activity) showed a similar effect, but only for spatial cues and not for symbolic cues. These neurons also showed higher activity during the delay period after the spatial ...
... location was cued, for both spatial and symbolic cues. In contrast, “visual-motor” neurons (with both visual and saccade-related activity) showed a similar effect, but only for spatial cues and not for symbolic cues. These neurons also showed higher activity during the delay period after the spatial ...
Embedding Neurological Autonomy in Gait Entrainment
... markedly higher under autonomous entrainment than under external entrainment. It also argues that dopamine reward is considerably higher when the visual feedback geometry is two-dimensional, as in the case of checkerboard tiles, than when it is one-dimensional, as in the case of transverse lines. Th ...
... markedly higher under autonomous entrainment than under external entrainment. It also argues that dopamine reward is considerably higher when the visual feedback geometry is two-dimensional, as in the case of checkerboard tiles, than when it is one-dimensional, as in the case of transverse lines. Th ...
clinical assessment of dementia
... 9. The Physical and Neuropsychiatric Examination for Dementia The examination component of a dementia evaluation includes the physical examination, neurological examination, and mental status examination. A basic physical examination is essential to exclude severe cardiovascular or cerebrovascular d ...
... 9. The Physical and Neuropsychiatric Examination for Dementia The examination component of a dementia evaluation includes the physical examination, neurological examination, and mental status examination. A basic physical examination is essential to exclude severe cardiovascular or cerebrovascular d ...
Now you see it: frontal eye field responses to invisible targets
... of a computer screen. On most trials, a dim target spot was flashed at one of eight locations around the fixation point, one of which was within the receptive field of the FEF neuron under study; on the remaining trials, no target appeared (Fig. 1). On all trials, a ring of bright spots then masked ...
... of a computer screen. On most trials, a dim target spot was flashed at one of eight locations around the fixation point, one of which was within the receptive field of the FEF neuron under study; on the remaining trials, no target appeared (Fig. 1). On all trials, a ring of bright spots then masked ...
Attention - Biology Courses Server
... • Resting state activities likely include monitoring environment and daydreaming. • Attention confers behavioral flexibility. – We use attention to focus mental resources. – Network of brain areas, priority maps – Allocation of attention followed by selective enhanced processing in sensory cortex • ...
... • Resting state activities likely include monitoring environment and daydreaming. • Attention confers behavioral flexibility. – We use attention to focus mental resources. – Network of brain areas, priority maps – Allocation of attention followed by selective enhanced processing in sensory cortex • ...
The continuous performance test: a window on
... limbic system. The involvement of the limbic system as well as the medial and dorsolateral frontal cortex is seen as resulting from their respective inputs into the association areas, which in turn impact on the inferior parietal lobes to inhibit or facilitate attentional response. The posterior par ...
... limbic system. The involvement of the limbic system as well as the medial and dorsolateral frontal cortex is seen as resulting from their respective inputs into the association areas, which in turn impact on the inferior parietal lobes to inhibit or facilitate attentional response. The posterior par ...
Awakenings and Neurotransmitters
... disease begin to emerge. 2. The loss of dopamine causes the nerve cells of the basal ganglia to fire out of control, leaving patients unable to direct or control their movements in a normal ...
... disease begin to emerge. 2. The loss of dopamine causes the nerve cells of the basal ganglia to fire out of control, leaving patients unable to direct or control their movements in a normal ...