Understanding Visual Perception: Why We Sense Depth and Hidden Objects
Eyes and Brain 2 Doctor, I feel that because our eyes perceive things in three dimensions, we tend to think that objects that are blocked have something behind them. However, there are also flat surfaces, like in the game Counter-Strike, where the walls appear three-dimensional, ...
Dr. Gao Chunde reply Neurology
The relevant principle can be referenced from 3D Magic Eye, where the eyes integrate flat images in the brain to perceive three-dimensional images.[Read More] Understanding Visual Perception: Why We Sense Depth and Hidden Objects
The Connection Between Eyes and Brain: Perception Beyond Vision
The relationship between the eyes and the brain? When we close our eyes, our eyes do not transmit images to the brain, yet we can still perceive the external world. This phenomenon occurs because our brain relies on memory, past experiences, and other sensory inputs to construct ...
Dr. Gao Chunde reply Neurology
In addition to vision, human senses include hearing, tactile sensation, smell, and taste. When vision is obstructed, such as in the case of blindness, individuals can still perceive changes in their environment through the movement of surrounding air via touch or hearing. When a ...[Read More] The Connection Between Eyes and Brain: Perception Beyond Vision
How Our Brain Perceives Hidden Objects: The Eye-Brain Connection
Eyes and brain When we see an object that is partially obstructed, our brain fills in the missing information based on prior knowledge and experience. For example, when looking at a screen, if part of the image is blocked by a wall, our brain uses context and memory to infer that...
Dr. Gao Chunde reply Neurology
Consent is the integration of experience and memory in the brain to process visual outcomes.[Read More] How Our Brain Perceives Hidden Objects: The Eye-Brain Connection
Understanding Early Waking: Is It a Sign of Brain Aging?
I have been waking up early every day for the past few months? Hello, I have been experiencing early waking every day for the past few months. I go to bed around 11 PM and always wake up around 7 AM the next morning. This is quite different from before when I could sleep until my...
Dr. Gao Chunde reply Neurology
There are no absolute benefits to excessive or insufficient sleep. As people age, a slight reduction in sleep duration is normal. With less physical and mental exertion during the day, individuals may naturally adjust their sleep needs. Some people may also develop a habit of nap...[Read More] Understanding Early Waking: Is It a Sign of Brain Aging?
Summer Headaches: Understanding Heat-Related Pain and Health Risks
Headache due to hot weather? As summer temperatures rise, I often experience severe headaches, particularly when my head is in a lower position, such as when squatting. The pain can feel as if the blood vessels in my brain are about to burst, and there is a strong throbbing sensa...
Dr. Gao Chunde reply Neurology
Typical symptoms similar to migraines are triggered by high temperatures and are not directly related to cardiovascular diseases. If the symptoms worsen or affect daily life and work, one should seek treatment from a neurologist.[Read More] Summer Headaches: Understanding Heat-Related Pain and Health Risks
Understanding Sudden Backward Falls and Vacant Stares in Children
A child suddenly falls backward and has a blank stare? Children suddenly falling backward and appearing dazed, only to regain awareness after a while, has occurred many times this semester. I am very concerned and would like a prompt response.
Dr. Gao Chunde reply Neurology
It may be an epileptic seizure; you can consult a pediatric neurologist or a neurologist for further examination and treatment.[Read More] Understanding Sudden Backward Falls and Vacant Stares in Children
Unexplained Head Pressure and Body Swelling: What to Do Next?
Feeling of head fullness and generalized edema with no identifiable cause? Two months ago, I suddenly experienced a feeling of head fullness, and the next day I had swelling, especially in my face and neck. I have already consulted with both immunology and rheumatology, as well a...
Dr. Gao Chunde reply Neurology
You can consult the Metabolism (Endocrinology) department.[Read More] Unexplained Head Pressure and Body Swelling: What to Do Next?
Managing Acute Relapses in Multiple Sclerosis: Steroid Treatment Insights
Acute treatment of multiple sclerosis? Hello, my sister's multiple sclerosis has relapsed again, and I'm very worried. I would like to ask you about something. Everyone online says that for acute episodes, high-dose steroids should be injected, so we went to the emergen...
Dr. Gao Chunde reply Neurology
The physician confirms the presence of objective evidence of symptoms with acute exacerbation and may administer high-dose intravenous corticosteroids for three to seven days.[Read More] Managing Acute Relapses in Multiple Sclerosis: Steroid Treatment Insights
Understanding Sudden Hand Numbness: Causes and Concerns
Sudden hand numbness!!!??? Hello, Chief Physician. After some changes at home, I suddenly felt numbness in my hand today, but it’s not complete weakness or loss of sensation. When I yawn, sometimes I feel tightness in my facial and oral area. Occasionally, while walking, I feel a...
Dr. Gao Chunde reply Neurology
These symptoms are not very specific. It is advisable to maintain a regular lifestyle, ensure adequate rest, and monitor if these symptoms persist. If problems continue, you may seek assistance from a physician in person at a hospital.[Read More] Understanding Sudden Hand Numbness: Causes and Concerns
Caring for an Elderly Relative with Dementia: Tips and Medication Options
Dementia in the elderly Your grandmother is 81 years old and has recently started to have difficulty recognizing the way home. The family is usually busy with work and has previously suggested hiring a caregiver, but there is a lack of trust in that option. How should we care for...
Dr. Gao Chunde reply Neurology
Dementia, aside from degeneration, can also be caused by identifiable factors that lead to cognitive decline and memory loss. In some cases, certain medications may be responsible for these symptoms. It is advisable to first consult a neurologist to identify and address any manag...[Read More] Caring for an Elderly Relative with Dementia: Tips and Medication Options
Persistent Leg Cramps in Elderly After Stroke: Seeking Solutions
Persistent leg cramps in the elderly? After my mother suffered a thrombotic stroke, she has been experiencing persistent leg cramps, averaging a small cramp every ten minutes (tight cramps from the calf to the foot) and a larger cramp once an hour (with her body arching). She has...
Dr. Gao Chunde reply Neurology
Although post-stroke patients are prone to seizures as a sequela, the characteristics you described seem to exhibit a regular periodicity. Another common condition in the elderly is periodic limb movement disorder, which typically occurs during the onset of sleep or in light slee...[Read More] Persistent Leg Cramps in Elderly After Stroke: Seeking Solutions
Understanding Postural Headaches: Causes and When to Seek Help
Headache, change in posture? Hello, doctor. My question is that when I change my posture, usually from sitting to standing, I experience a brief headache that lasts about 5 seconds. It feels like pressure on the top of my head, but it doesn't happen every time; it occurs a f...
Dr. Gao Chunde reply Neurology
The most well-known headache associated with posture changes is low cerebrospinal fluid (CSF) pressure headache. This condition typically arises from specific causes that lead to CSF leakage, such as lumbar puncture for anesthesia or contrast imaging, spinal trauma, or excessive ...[Read More] Understanding Postural Headaches: Causes and When to Seek Help
Understanding Dizziness: Causes and Concerns in Neurology
I feel a bit lightheaded? Hello Doctor: A few days ago, after washing clothes and lifting my head to hang them up, I felt a bit uncomfortable and experienced a sensation of dizziness. This has happened a few more times since then. Although it’s not very frequent, I still feel une...
Dr. Gao Chunde reply Neurology
The common condition is benign paroxysmal positional vertigo (BPPV), which is, as the name suggests, benign. It may occur intermittently and is related to certain positional movements. Typically, the discomfort lasts for a few seconds and resolves on its own once the individual s...[Read More] Understanding Dizziness: Causes and Concerns in Neurology
Understanding Numbness in Hands and Feet After Epilepsy Recovery
Numbness in the hands and feet? I had a history of epilepsy in my childhood, but it has been cured. Recently, when I feel very happy, my hands and feet become numb. Is this related to my epilepsy?
Dr. Gao Chunde reply Neurology
There are various types of seizures, including sensory, motor, autonomic, and even psychological manifestations. It is difficult to completely rule out any connections between them. If you have concerns, you may visit a neurology clinic to have a specialist analyze and explain yo...[Read More] Understanding Numbness in Hands and Feet After Epilepsy Recovery
Understanding Nerve Issues: Causes and Symptoms of Numbness and Weakness
Paralysis Doctor, I have been experiencing symptoms that started with numbness in two fingers on each hand, but it has since progressed to numbness in all my fingers. Currently, both of my palms feel numb, and my toes are also numb, extending to the soles of my feet. The most sev...
Dr. Gao Chunde reply Neurology
The emergence of new symptoms indicating disease progression suggests that there are unresolved issues. It is important to return to the outpatient clinic as soon as possible to inform your physician of your current condition. This will allow them to arrange appropriate managemen...[Read More] Understanding Nerve Issues: Causes and Symptoms of Numbness and Weakness
Understanding Numbness and Rapid Heartbeat: Neurological Concerns Explained
Numbness in the hands and feet, rapid heartbeat? Hello Doctor: Recently, I have been experiencing intermittent numbness in my limbs, primarily in my left hand and foot. Today, the numbness is particularly severe, affecting the entire left side of my body, from head to toe. This w...
Dr. Gao Chunde reply Neurology
If your symptoms have worsened compared to when you visited the neurologist, or if they continue to deteriorate despite medication, it is advisable to return to the hospital for further evaluation. If the neurologist's objective neurological examination aligns with your clin...[Read More] Understanding Numbness and Rapid Heartbeat: Neurological Concerns Explained
Should I Consult a Neurologist for Nerve Damage After Tooth Extraction?
Should I seek medical attention for inferior alveolar nerve injury caused by tooth extraction? Hello Dr. Gao: Thank you for taking the time to answer my questions! I had my lower left wisdom tooth extracted four days ago, and I have been following the doctor's advice regardi...
Dr. Gao Chunde reply Neurology
The inferior alveolar nerve is a small branch of the trigeminal nerve. After wisdom tooth extraction, the chin usually recovers well, but sometimes localized swelling in the area can affect nerve function. The recovery time is not fixed; it can take a couple of months for some in...[Read More] Should I Consult a Neurologist for Nerve Damage After Tooth Extraction?
Understanding Hand Tremors: Genetic Factors and Health Concerns
My hands are shaking? Hello Dr. Chen, I am 19 years old this year. Since I was young, I have experienced slight involuntary shaking in my hands. This year, my dad, who is 60, also has significant tremors in his hands. Could the reason for my hand tremors be genetic, or is there s...
Dr. Gao Chunde reply Neurology
First, it is important to determine the type of condition that is causing your father's hand tremors, including when they began and whether they are accompanied by other symptoms. We need to ascertain if it is essential tremor, which can occur in younger individuals, or if i...[Read More] Understanding Hand Tremors: Genetic Factors and Health Concerns
Dizziness When Lying on Left Side: Possible Causes and Solutions
Dizziness when lying on one's side? Hello Doctor: A few months ago, one morning when I woke up and turned to my left side at a 90-degree angle, I suddenly felt a wave of dizziness and the room spinning. I quickly turned back to a lying position and returned to normal. After ...
Dr. Gao Chunde reply Neurology
Benign Paroxysmal Positional Vertigo (BPPV) typically resolves on its own after a day or two of rest for young individuals, but it is prone to recurrence. If symptoms are severe or become more pronounced, it is advisable to consult a neurologist or an otolaryngologist for further...[Read More] Dizziness When Lying on Left Side: Possible Causes and Solutions
Muscle Twitches and Weakness: Understanding Neurological Symptoms
Muscle twitching and leg weakness? Hello, Doctor Gao: I would like to consult you about some symptoms my family member has been experiencing recently. I would like to know what kind of condition this might be. 1. There are muscle twitches in the body, but they are not in a fixe...
Dr. Gao Chunde reply Neurology
Most cases are benign muscle twitches or spasms, especially related to stress or tension, but a small number may indicate a motor neuron issue. If the symptoms persist, it is advisable to consult a neurologist for further evaluation.[Read More] Muscle Twitches and Weakness: Understanding Neurological Symptoms