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The first reaction can be almost immediate: a sharp gasp, rapid breathing, an intense sensation of cold and a strong urge to get out. This is more than simple discomfort. Sudden exposure to very cold water triggers a series of automatic physiological responses. This is known as the cold shock response. It can affect breathing, heart function and blood pressure, particularly when exposure to cold is sudden. The first reaction may be a sudden gasp When the skin comes into sudden contact with very cold water, temperature-sensitive receptors send signals to the nervous system. The body responds by activating mechanisms designed to deal with the sudden thermal stress. One of the most noticeable responses is an involuntary gasp, often followed by rapid and deeper breathing, known as hyperventilation. This matters especially in water because losing control of breathing can make it harder to remain calm and maintain effective breathing. What happens to the heart and blood vessels? Cold shock a...
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Sponsored content by OLDSPELL For a man with a busy schedule, physical activity is often associated with the gym, running or a planned workout. But movement during the day does not start and end there. Walking to work, taking the stairs, going for a short walk during a break or doing things around the house are also forms of physical activity. The World Health Organization notes that physical activity can come from work, transport, exercise, leisure and everyday household tasks. Movement does not always have to look like a workout The idea that a man is only physically active when he is at the gym does not capture the whole picture. Some movement can become part of an ordinary routine. A man who spends long hours at a desk, for example, can get up more often, walk short distances or take the stairs when practical. This does not mean that a few minutes of walking replace a structured workout. It simply means that physical activity can be made up of different moments throughout the week....
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A mirror is such an ordinary part of everyday life that we rarely stop to think about what happens when we look at our own face for an extended period of time. We are not simply seeing an image. The brain is processing a face it knows extremely well — our own. How we perceive that face can be influenced by familiarity, attention, previous visual experience and the way we feel about ourselves. Our face is not just a static image Whenever we look in a mirror, the brain combines incoming visual information with an internal representation of our own face. Eye-tracking research suggests that people may look at their own face differently from the way they look at another person's face. Familiarity changes perception The brain adapts to visual information that it encounters repeatedly. In face perception, this process of visual adaptation can influence how features, expressions and even aspects of facial identity are perceived. This does not mean that a mirror actually changes our face. R...
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That moment when we put down our fork and realize we do not want another bite may feel simple. Biologically, however, fullness is the result of a continuous conversation between the digestive system and the brain. The body does not simply wait for the stomach to become «full». As we eat, mechanical and chemical signals from the gastrointestinal tract provide the brain with information about the amount and composition of the meal. The stomach starts sending signals As food enters the stomach, it expands and activates mechanisms that detect tension in its walls. These signals contribute to the sensation that we have eaten enough. But stomach distension is only part of the picture. Nutrients reaching the digestive tract also trigger chemical and hormonal signals involved in appetite regulation. The brain receives the message Signals from the gastrointestinal tract communicate with neural circuits involved in hunger and satiety. This creates what is often described as the gut–brain axis. S...
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Our name is one of the most familiar words we hear. We have been hearing it since childhood, and over time it has become closely linked to our identity, our relationships and our everyday experiences. That may be one reason why our name can capture our attention even when we are not consciously listening for it. The effect is especially noticeable in busy environments. We may be talking to someone, surrounded by several conversations, and suddenly notice that someone has said our name. The brain appears to give particular priority to information that is personally meaningful. Why does our name stand out? Auditory attention does not work like a simple switch. Even when we focus on one conversation, the brain continues to process at least some information coming from the surrounding environment. The so-called cocktail party effect describes this ability to focus on one source of sound while still detecting certain meaningful stimuli in the background. Our own name is one of the classic e...
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Το όνομά μας είναι μία από τις πιο οικείες λέξεις που ακούμε. Το έχουμε ακούσει αμέτρητες φορές από την παιδική μας ηλικία και το έχουμε συνδέσει με τον εαυτό μας, τις σχέσεις μας και την καθημερινή μας ζωή. Ίσως γι’ αυτό μπορεί να τραβήξει την προσοχή μας ακόμη και όταν δεν προσπαθούμε συνειδητά να ακούσουμε. Το φαινόμενο γίνεται ιδιαίτερα εμφανές σε χώρους με πολύ κόσμο. Μπορεί να συζητάμε με κάποιον, να ακούμε πολλές φωνές γύρω μας και ξαφνικά να αντιληφθούμε ότι κάποιος είπε το όνομά μας. Ο εγκέφαλος φαίνεται να δίνει προτεραιότητα σε πληροφορίες που έχουν προσωπική σημασία για εμάς. Το όνομά μας ξεχωρίζει ανάμεσα στους άλλους ήχους Η ακουστική προσοχή δεν λειτουργεί σαν ένα απλό «on/off». Ακόμη κι όταν συγκεντρωνόμαστε σε μία συζήτηση, ο εγκέφαλος συνεχίζει να επεξεργάζεται μέρος των πληροφοριών που φτάνουν από το περιβάλλον. Το λεγόμενο «φαινόμενο του cocktail party» περιγράφει ακριβώς αυτή την ικανότητα: μέσα σε ένα περιβάλλον με πολλές ταυτόχρονες φωνές, ορισμένα ιδιαίτερα σημα...
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Testosterone is linked to sexual function, muscle mass, bone health, energy and fertility. That does not mean every man needs regular testosterone testing. Current guidelines do not recommend routine screening of men who have no symptoms. Testing is more appropriate when symptoms or specific medical factors raise a concern about testosterone deficiency. Which symptoms may lead to testing? Low testosterone, also called testosterone deficiency or hypogonadism when diagnostic criteria are met, can affect men in different ways. Symptoms that may lead a doctor to consider testing include: - reduced sex drive, - erectile problems or fewer spontaneous erections, - lower energy, - loss of muscle mass, - reduced fertility, - changes in mood or concentration, - reduced body hair, - low bone density or unexplained anemia in some cases. However, none of these symptoms alone proves that testosterone is low. Fatigue, low mood and concentration problems, for example, can...
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