Thursday, 27 August 2015

How Do Animals Sleep? by Emily Lauterpacht

On a recent Marine Biology trip to Turkey, where we were studying turtles, the question of how they slept arose. A few ideas, such as “with one eye open”, were tossed around, before the question was dismissed. However it got me thinking about how they, and other animals, sleep.   


Turtles

Turtles don’t sleep so much as rest; they will do this under ledges or rocks where possible, presumably to stop themselves floating off. However, if they are in deeper water, they will float near the surface. While resting, they close their eyes like humans, but are conscious enough to know to surface in order to breathe when necessary.

Horses

Although many horses have become domesticated, and so are rarely preyed on, they still have many adaptions of a prey animal; by being able to sleep standing up, horses are able to escape danger more quickly, as they don’t have to waste time struggling up.  Horses have a network of ligaments and tendons called the stay apparatus that allows them to sleep standing up, by locking their legs so that they are able to relax their muscles. The stay apparatus in horses’ front and back legs differ; while the front leg just needs to relax to use the stay apparatus (it is always in place), a horse needs to literally hook one bone over a knob on another bone to engage the stay apparatus in its hind legs. However, usually once a day, a horse will lie down for a deeper sleep, as it seems to be unable to achieve this while standing.

Dolphins

Dolphins, along with other cetaceans (whales, orcas and porpoises) sleep in a similar way to birds – a type of sleep called unihemispheric slow-wave sleep.
This means that when a dolphin “sleeps”, half of its brain (one hemisphere) shuts down, and it closes the opposite eye. This then leaves the other half of the brain and the other eye to control breathing, observe surroundings and maintain muscle movement to keep the dolphin warm. While in this sleep-like state, the dolphin will either swim slowly or stay still nearthe water’s surface.
Human babies, like many other animals, spend a significant amount of time sleeping, but dolphin babies (calves) don’t sleep at all in the first few months after they are born and when they become older, they sleep while being towed along in their mother’s slipstream (echelon swimming). 

Bats

Most people know that bats sleep hanging upside down, but not many know why. The main reason is that, unlike birds, their wings don’t produce enough lift to take off from the ground, so by roosting upside down, they can spread their wings and “fall” into flight. It also helps them hide from predators. In a somewhat similar way to horses, bats have evolved a mechanism to enable them to lock their talons closed, so that they can relax while hanging upside down; their tendons in their talons are connected to their upper bodies, meaning that their body weight pulls on the tendons, locking the talons closed.  
Bats are also known for being nocturnal, so they sleep during the day.

Swifts

The swifts found in the UK have normally migrated from South Africa, a distance of over 6000 miles. Swifts rarely land (sometimes they won’t land for 6 months), other than at nest sites, and routinely fly at 10,000ft at night-time. This leads us to presume that swifts must sleep “on the wing”, although it has not been proved, as no electroencephalograms (EEG) have ever been performed

http://www.mybedframes.co.uk/media/215178/MBF-Animal-Sleeping-Habits.jpg

Emily Lauterpacht



Sunday, 16 August 2015

The Science of Beauty by Emily Lauterpacht and Lauren Carter

What is beauty?

   “In all the arts, something is being explored that has to do with beauty” – David Trubridge
   Beauty can be defined as a characteristic that ‘provides a perceptual experience of pleasure or satisfaction’, but what really is the meaning of beauty? Why is it that we find some people attractive and others unattractive, and why does the concept of beauty play such an important role in our lives?
     Many scientific studies have been carried out in order to discover what it is that makes someone attractive and the reasoning behind it. One of the greatest links that has been found to explain what makes someone attracted to someone else is the link between attractiveness and evolution; the concepts of what we find attractive often lie behind what we look for in a partner and what characteristics will be beneficially passed on to our offspring. It has been found that our subconscious brains look for desirable traits that we wish to pass on to our offspring so that they may have a higher probability of finding a mate and consequently reproducing.  
     Results have also shown that one of the key ideas behind the science of beauty is the idea of symmetry; a face which consists of a high degree of symmetry is often seen as more attractive than one where the features may be slightly distorted. According to a study carried out at the University of Louisville, where a group of individuals were shown pictures of people of different ethnicity they all showed the same general preferences – that which showed the highest rate of symmetry.  A superficial formula has been created that show the ideal proportions for a female face, including:
  • Eyes should be 1/5 the width of the face
  • Chin should have a length 1/5 the height of the face
  • Lip edges should line up with the pupil of the eye, no thicker that the closed eyelids
  • The nose area should be less than 5% of the area of the whole face, with the bridge of the nose extended straight.
    These features are often seen as what makes people beautiful and any deviations, such as a crooked nose, disrupt this perception of beauty.
    It has also been demonstrated that men are attracted to features that signal youth, including full lips and a good muscle tone. Features that represent good health such as clear and smooth skin are also seen of as desirable.
    Many studies have been conducted in order to comprehend the question of what beauty means. These include studies of what causes a person to be attracted to someone else, and what influences this attraction. Studies at Stockholm University have proposed the idea that our attraction to other people is caused by hormones that we are exposed to both in the uterus and also when going through puberty. Studies from the University of Montreal have also shown that we are generally attracted to people who both look and smell like our own parents; this theory has been proven with a study at the University of Chicago where a ‘fragrance test’ was taken to see what smells people were most attracted to and the majority chose ones that had vast similarities to their parents.

How does being beautiful affect day-to-day life?

    The way we look affects us from birth; as of the day we are bought into the world we are judged on our appearance, from being treated differently as babies through to the careers that we pursue in later life. Studies have shown that children who are thought to be less attractive often get less attention in class than their attractive counter parts. They also receive fewer awards and gain less approval from parents. Later in life beauty may even stretch to saving someone’s life, as you are about 20% more likely to be assisted by strangers in an emergency if you are attractive.
     Most advantages associated with beauty can be explained by the ‘Halo Effect’. This is a theory of when a beautiful person is thought to be better in some way by those who don’t know them, due merely to their appearance. Their attractiveness may lead to the assumption that they are more desirable, confident, competent, trustworthy or likeable.  These perceived traits have a range of effects, from being paid more to receiving lighter court sentences. Those considered beautiful are more likely to get promotions, as they are generally more persuasive. This may be due to a greater self-confidence, or any bias, due to the ‘Halo Effect’. However, companies with an attractive executive have actually been proven to have higher sales (according to a study conducted on 300 Dutch advertising agencies), so these seemingly unreasonable promotions are actually to an extent beneficial and can therefore be somewhat justified.
      There are few negative assumptions associated with beauty and they tend to stem from jealousy. This is especially common between people of the same sex, who are seen as rivals when trying to find a mate. People may see those who are more attractive as less talented, more materialistic, snobbish, vain and shallow. However no studies have ever been carried out to support these ideas. There is also the “dumb blonde” stereotype, although it is thought that those with symmetrical bodies (also linked with beauty), are more intelligent.
     While generally it is presumed that if you are more attractive, you are more likely to find a mate, beauty may also carry certain disadvantages. Some beautiful people struggle to attain satisfaction or settle on one person, as they have too many choices, and so just one person may never be good enough.

Beauty and the body

      When it comes to the body, most of what is considered attractive is down to evolution. Desirable bodies are ones which we, normally subconsciously, think will be best for reproduction and passing on our genes. This is where the stereotype of all men liking women with large breasts, slim bodies and wide hips come from (these form the ideal hour glass figure). Large breasts indicate an ability to feed offspring, and slim bodies are a suggestion of fitness and general health. The most attractive bodies have a waist-to-hip ratio of 7:9, as wide hips help reduce problems when giving birth. However, these body ideals vary from country to country. In Brazil they prefer “small breasts and big derrieres, whereas Americans want big chests” according to the well-known plastic surgeon, Dr Ivo Pitanguay. In areas where food is scarce, or in the past in Britain, the larger you are, the more attractive you are considered to be, which contrasts with the size zero culture found in Britain and America today.  These disparities, like the comings and goings of beards throughout the ages, are thought to reflect cultural variations and fashions.
      As with facial symmetry, body symmetry is considered most attractive. It is considered an indicator of social dominance, fitness and overall health. Body symmetry, along with general attractiveness has been linked to intelligence according to Satoshi Kanazawa, an evolutionary psychologist.

     An overall conclusion can be drawn that beauty stems generally from symmetry and the idea of ‘normal sized’ features, which are generally perceived as more desirable.
‘If vanity is not our chief feature, it is at least our secondary feature’ – Robert Burton
     However while the impacts of beauty are widespread, and the influence it has on life is substantial, it is crucial that we, as a species, do not let our lives be run by our appearance. Beauty is only one factor of what makes us attractive and in its very nature cannot be studied; the research of this topic therefore is not the study of beauty, merely the study of conventional attractiveness.

Emily Lauterpacht and Lauren Carter

Monday, 10 August 2015

Technical issues

After a few months offline due to technical issues, the blog is back up and running. I will be uploading a new post in the next few days.

Emily Lauterpacht