The ability of mammals to correctly adapt their behavior to an environment that is always changing is a fundamental capability by the formation and retrieval of memories. Arguably one of the most important phases in the sleep cycle of a mammal is known as Rapid Eye Movement or REM sleep. Research suggests that REM plays a crucial role in the consolidation of memories essentially the processing of memories in our system; mainly our declarative memory system. The more familiar of the two to humans would be our declarative memory. It is the conscious component that includes remembering facts and events. Non-declarative memory, also known as implicit memory, includes our unconscious memory. When scientists began to take a look into REM sleep they …show more content…
One study focuses on giving pharmacy drugs to “increase sleep spindles”, which in turn “enhances recognition for Negative and high-arousal memories” (Kaestner, Mednick, and Wixted, 2013). They go into detail about emotional memory and what it entails. They describe emotional memories as memories that give us pleasure or make us anxious. They can also determine “arousal” which determines how low or high our motivation is towards a particular stimulus. Emotional memories link ourselves to our own survival and pleasure, ranking the memories higher and therefore processes more quickly. Our declarative memory is the memory in which we retain personal information and facts that our conscious mind receives. Declarative memories can be broken down further into episodic and semantic memory. The difference being episodic memories remembers experiences and specific events while semantic retains meanings and facts. The storage of our long term declarative memories varies throughout the structure of the brain. We see encoding within the hippocampus and the medial temporal lobe. We see consolidation mainly within in the temporal cortex. These facts were given new light when the case of H.M. came around. H.M. gave scientists new insight on the location of the storage of our long term memory versus short term memories, because of the specific areas in which the surgeons came in contact with during the procedure. The ability of REM sleep to …show more content…
The first method relies on playing the memory again during the consolidation process as a facilitator. (Bennion, Kesinger, and Payne, 2015). This process is known as “reactivation”, (Bennion et al., 2015). The same areas that light up when we are learning are also present when we are sleeping leading researchers to believe that we are processing information even as we sleep. Selective reactivation suggests that we choose between memories that are important and ones that are not. We will process the vital memories first and decrease in significance from
All mammals exhibit Rapid-Eye-Movement, or REM, sleep, and yet on certain levels this type of sleep would seem to be disadvantageous. During REM sleep, which is when most dreams occur, the brain uses much more energy than during non-REM (NREM) sleep. (1) This "waste" of energy coupled with the increased vulnerability of this state on account of the body's paralysis at this time suggests that there must be a very important reason, or reasons, for the existence of REM sleep and in extension of dreams. Determining the function of dreams, however, has proved very problematic with many arguments which directly oppose each other. Some of the primary functions of dreaming have been tied to is role in development, its production of neuro-proteins, and also to how it may allow for the "rehearsal" of neurons and neuronal pathways. The influence of dreaming on learning is one of the hottest debates. Some argue that dreams aid in learning, others that dreams aid in forgetting, and yet others that dreams have no effect on learning or memory. That REM sleep seems to aid in development might argue that REM sleep may be connected to learning. It seems that most scientists believe that REM sleep aids in certain memory consolidations although some argue that it actually leads to "reverse learning.
Understanding the reasoning behind amnesia and the hippocampus is of critical importance in neuroscience. Discussed by Cipolotti & Bird (2006), LTM impairments can lead to anterograde and retrograde amnesia if the medial temporal lobe (MTL) is damaged bilaterally. Specifically, the two most important types of LTM related to anterograde and retrograde amnesia are episodic and semantic memories. Conversely, many researchers have long debated the true functions of the hippocampus and have allowed two theories to emerge. The standard model of consolidation (SMC) assumes that the hippocampus is important in consolidating LTM, while the multiple trace theory (MTT) argues that information is encoded by specific memory traces by the hippocampus. These two theories help further explain the vast functions of the hippocampus. However, in regards to amnesic patients, the SMC has proven to be more widely accepted due to reported results implying that the hippocampus is important in consolidating LTM. In contrast, in anterograde patients, memories can be retrieved through recollection and familiarity. In fact, it has been proposed that the recol...
However, scientists are beginning to uncover that stress can also inhibit the plasticity and neurogenesis within the hippocampus. By inhibiting these processes, stress can negatively influence the mechanism responsible for memory consolidation in the brain. These effects, if not treated promptly with suitable sleep, could have harmful and damaging effects on nerve cells in the hippocampus. By identifying these effects within sleep deprivation, scientists can formulate new effective drugs and mechanisms to enhance memory impairment caused by sleep loss.
Rasch, B., & Born, J. (2008). Reactivation and consolidation of memory during sleep. Current Directions in Psychological Science, 17, 188-192. doi: 10.1111/j.14678721.2008.00572.x
...ep. There are events in sleep that are associated with synaptic modification, which is the basis of brain rewiring that enhances cognition. There is evidence that sleep accelerated transcription of cortical genes that are associated with protein synthesis9. These newly generated proteins are known to be required for strengthening of existing synapses and building new synapses. Studies have found increase of factors associated with brain-plasticity and enhanced learning during sleep5. These factors include phosphorylated or activated CREB, a transcriptional factor, as well as Arc, BDNF, and NGFI-A. These evidence help explain how sleep can influence brain rewiring through synaptic modification. This mechanism helps explain how sleep can modify the brain and ultimately enhance learning. This is a strong evidence that supports the synaptic downscaling hypothesis.
Sleep is an extremely interesting phenomenon in which the mind almost completely departs from the usual realm of consciousness. It is distinguished from quiet wakefulness and a decreased ability to react to stimuli where we become less aware of our surroundings. However, it is more easily reversed than being in hibernation or a coma. It is a function that has been extensively researched by many. After all, we would not have evolved a mechanism that forces us to spend one-third of our lives sleeping unless sleep did us some good. What good does it do tough? Over the years, many theories have been proposed as to why we need sleep. The simplest is that it saves energy. An individual’s energy expenditure and demand is reduced during the day, or night, as an animalistic instinct when they are least efficient to search for food. This is also supported by the decrease of body temperature and caloric demand throughout sleep. For example, when NASA sent a robot to mars, it was programmed to shut down at night so exploration would not waste energy. This is like our bodies, as they need time to recuperate and to slow down. In addition, sleep provides an occasion for restorative functions of the brain where the body is allowed sufficient time to repair and rejuvenate itself. For example, animals that are deprived of sleep entirely lose all their immune function and will soon die in a matter of weeks. Other findings have shown that many restorative functions in the body like tissue repair, muscle growth, and growth hormone occur mainly during sleep. When people are deprived of sleep, inhibitory transmitters accumulate in the brain, interfering with attention and learning. People that are well rested will notice when their attention lapses, a...
Sleep occurs in a series of recurring stages (Smith et al, 2013). These stages can be separated into NREM sleep, and REM sleep (Smith et al, 2013). NREM (non rapid eye movement)...
(Man/Woman): Hey everyone, I’m going to talk about something that most American colleges have: “Fraternities and Sororities”. “Fraternities and Sororities” are groups of students that usually live together in a house. Members are usually called “brothers” or “sisters”. These social groups often throw parties. They also host events where they raise money to help people. “Fraternities and Sororities” are a huge part of American college culture. (65 words)
The mammalian brain contains several different memory systems, which can be divided into declarative and non-declarative memory systems. Declarative memory can be further divided into episodic and semantic memory, and non-declarative memory can be divided into priming, associative learning, and procedural memory.
Despite big advances in recent years, memory is still a bit of mystery and there are disagreements among the experts about exactly what is going on. But now memory is seen as a function of the brain, and is not placed any more in the heart… It’s defined as the ability to store and retrieve information.
Memory is defined as “the faculty by which the mind stores and remembers information” (“Tmesis”, n.d.); and it is a purely mental process that always access to stored information. Memories can either be pleasant or unpleasant, but the fact is, they still exist either way. They are an essential part of who we are and without them, we would struggle to establish our identity. Besides being images of the past, memory is equally emotions too. Emotions are the main reason a memory is either stored or forgotten. They are a key factor in memory.
Many studies of the role of sleep are partial or total sleep deprivation studies which support Oswold’s restoration theory. One of these supporting studies was Dement’s. He deprived participants of REM sleep and consequently found that they increased their number of attempted REM stages from 12 to 26 over 4-7 nights. During their first uninterrupted night, participants increased their REM sleep by 10% which is known as REM rebound. This suggests the importance of REM and the possibility that the purpose of sleep is to get into REM sleep. The participants reported anxiety, irritability and difficulty concentrating which shows that REM sleep is needed to avoid these affects and enable brain recovery which corresponds with Oswold’s theory. Even so, Dement’s study has low ecological validity, it has low population validity because there were only 8 participants and they were a self-selected sample. Participants would probably have shown demand characteristics because the experiment took place in a lab. It also has low mundane realism because people would not usually sleep in a lab and be interrupted repeatedly.
Sleep is an integral part of life, but differs from other states of reduced consciousness in that the brain is still somewhat active. Sleep is an “altered state of consciousness, [with the sleeper losing] substantial contact with the external world.” (Gazzaniga, M., & Heatherton, T., 2016). Nonetheless, brain activity has an extensive role in the creation of “sleep”, generating two distinct types - slow-wave sleep, also referred to as deep sleep, and rapid eye movement, also called the dreaming stage. Comprised of five stages, sleep is a complex state of mind, also consisting of patterns known as circadian rhythms. Operating as a behavior, sleep alters to suit our bodily needs, and informs us of such needs through an intricate network of nerves. Furthermore, without obtaining an ideal amount of sleep, problems can arise that may affect one’s wellbeing. Detailed research and studies previously conducted on the subject of sleep allows the accumulation of information to be
Vandekerckhove, M., & Cluydts, R. (2010). The emotional brain and sleep: An intimate relationship. Sleep Medicine Reviews, 14(4), 219-226. doi:10.1016/j.smrv.2010.01.002
Rasch, Björn, and Jan Born. "About Sleep 's Role in Memory." Physiological Reviews. American Physiological Society, n.d. Web. 06 May 2016.