Recalling a memory

• Declarative (or Semantic) memory is our factual memory which stores the details like the information and figures, but not the visual, emotional or sensory details.
• Episodic Memory stores our life events, for us to be able to relive our past, complete with all the atmospheric details.
• Procedural Memory is the memory of skills, in which the brain records the sensory input from the various body parts and muscles during a particular activity, and is able to replicate the muscle application and movement.

It is the area of the brain responsible for learning new skills.

Using brain mapping tools, scientists have discovered that the more we use a certain body part, the more information about it is stored in the Primary Motor Cortex region of the brain, which alters its size and the number of connections with the other regions of the brain.

• In the early 1900s, Sigmund Freud gave childhood amnesia its name. The most commonly accepted explanation for childhood amnesia was that children couldn't form stable memories until age 7 - even though evidence for this idea was lacking.
• In the late 1980s, experiments revealed that children three and younger keep their memories, although it is limited. At 6 months of age, infants' memories last for a day, and by age 2, for a year. At around age 6, children begin to forget many of their earliest memories.

From birth to our early teens, we have far more links between brain cells. The excess brain mass is very adaptable and allows children to learn very quickly.

But the adaptability comes with a price. The large and complex network in the brain is still busy growing and not as capable of forming memories efficiently as in adulthood. Consequently, long-term memories created in our first three years of life are the least stable and prone to be forgotten as we age.

• Get a good night's sleep or take a power nap after learning something new, to help retain and retrieve memories better. Sleep deprivation and acquisition of too much information will not help you save those memories.
• Get moving, to improve the flow of oxygen-rich blood in your brain and to trigger neuron growth and new connections in the brain - critical for memory.
• Improve your diet. Fats from food can build up the brain, resulting to poor blood flow.

Any system or device designed to aid memory:

• patterns of letters or words (common mnemonics)
• ideas (memory palace)
• associations (chunking)

What is it about brain matter that gives rise to consciousness? In particular, the neuronal correlates of consciousness (NCC) - the minimal neuronal mechanisms jointly sufficient for any conscious experience.

Consider this question: What must happen in your brain for you to experience a toothache?

The whole brain can be considered an NCC because it generates experience continually.

• When parts of the cerebellum, the "little brain" underneath the back of the brain, are lost to a stroke or otherwise, patients may lose the ability to play the piano, for example.  But they never lose any aspect of their consciousness. This is because the cerebellum is almost wholly a feed-forward circuit. There are no complex feedback loops.
• The spinal cord and the cerebellum are not enough to create consciousness. Available evidence suggests neocortical tissue in generating feelings.
• The next stages of processing are the broad set of cortical regions, collectively known as the posterior hot zone, that gives rise to conscious perception. In clinical sources of causal evidence, stimulating the posterior hot zone can trigger a diversity of distinct sensations and feelings.
• It appears that almost all conscious experiences have their origin in the posterior cortex. But it does not explain the crucial difference between the posterior regions and much of the prefrontal cortex, which does not directly contribute to subjective content.

Thomas Edison said that sleep is "a bad habit." Like Edison, we seem to think of sleep as an adversary and try to fight it at every turn. The average American sleeps less than the recommended seven hours per night, mostly due to electric lights, television, computers, and smartphones. 

However, we are ignoring the intricate journey we're designed to take when we sleep.

When we fall asleep, the nearly 86 billion neurons in our brain starts to fire evenly and rhythmically. Our sensory receptors become muffled at the same time.

The first stage of shallow sleep lasts for about 5 minutes.

When we draw something we are forced to consider in more detail and it’s this deeper processing that makes us more likely to remember it.

When you want to learn something in particular, then physical effort does seem to help, at least in the short-term. 

In an experiment, people that did 35 minutes of interval training 4 hours after learning a list of pictures paired with locations were better at remembering the pairs than those who did the interval training straight away.

After having experienced trauma, our brain can not function properly anymore, at least for a while. 

Among the negative effects that trauma leads to there is the risk of developing physical illnesses or the so-called Post-traumatic stress disorder.

When dealing with PTSD, the three parts of our brain, which are responsible for processing stress, suffer changes: the hippocampus, the amygdala function and the prefrontal/ anterior cingulate function.

Dreaming accounts for 20% of our sleeping time.

The length of dreams can vary from a few seconds to almost an hour. During REM sleep, the brain is highly active. The muscles are paralyzed, and the heart rate increases. Breathing can become erratic. 

Although eight hours is the common mention, optimum sleep can vary from person to person and from age to age.

One review that worked through 320 research articles concluded 7 - 9 hours of sleep are enough for adults. According to experts, too little or too much sleep can both have a negative impact on your health.

Night terrors are very intense episodes of fright during dreams. These frightening episodes are often accompanied by screaming or yelling, as well as by physical movement such as leaping out of bed or flailing in panic. 

Research suggests that sleep terrors occur during non-REM sleep dreaming, while nightmares tend to happen during REM sleep. 

Studies suggest that recurring dreams may contain more threatening content than regular dreams. Research suggests links between recurring dreams and psychological distress in both adults and children.