The Single Trial Learning : Implications For Episodic Memory Essay

Memory is divided into three categories. These categories consist of: sensory memory, short term memory and long term memory, out of these short term memory is the main focus in this essay. It has been widely researched due to interest of how much memory can be stored, how long this memory can be stored for and what information is memorised.

In the last half century several theories have emerged with regard to the best model for human memory. In each of these models there was a specific way to help people recall words and

Given the supposed role of the hippocampal system in encoding memory in long-term stores, researchers have eagerly tried to address this issue using PET and fMRI. One way in which they attempted to find evidence to support this involved face encoding and recognition in episodic memory. Episodic memory encoding is the process by which the experience of an event is

Messages become shorter when passed from one person to the next. Memories can be modified to fit one’s personal social experiences (i.e., conventionalization). Memory is unreliable, sensory stimuli are not stored as is but are actively transformed by the brain for storage depending on individual factors such as personal relevance and expectations. The most essential information is better remembered, but what is considered “most essential” may depend on an individual’s experiences. This suggests memory does not function as a video recording, but is a highly complex process that is influenced by an individual’s levels of attention, motivation, expectations, experiences, emotional state, etc. It also suggests that memory is an active process that involves constructing narratives out of events rather than passively recording

The combined findings provide the foundation for the hypothesis that there is more than one kind of memory, or rather that skill-based memories must be organised differently from fact-based memories since the former seem to be preserved in amnesia as opposed to the latter.

Memory is a cognitive function of the brain that is often taken for granted. Memory may have many purposes, but most importantly it is essentially a record of an entire life span. From this perspective memory is the most important aspect of consciousness. Unfortunately, through formal experimentation it has been shown that memory is fairly inaccurate, inconsistent, and often influenced by our own experiences as well as the bias of others. Memory is not only affected during an observed event, but there are instances where memory can be influenced after an event as well. There are also instances where memory can be affected retroactively due to personal experiences and biases. Incorrectly recalling the memories of one’s life is usually not

- “Episodic memory is defined as the conscious retrieval of personal experiences occurring within a specific context”

Memory in the human brain is a complex process which is easier understood by the use of theoretical constructs. Memories begin as sensory stimuli which become sensory memory which only last about one second, from there it moves into working memory which lasts for about twenty to thirty seconds and is used to process information. Within working memory there are a few separate processes, the central executive which directs attention, the episodic buffer which is a secondary storage lasting ten to twenty seconds, this area communicates with long term memory as well as the central executive. The visuospatial sketchpad which is used to visualise visual and spacial

Episodic memory is the ability to remember incidents in one individual’s life with detached information and then recall it later as conscious re-experiences. It is said that this trait is unique to humans, acting as a distinguishing criteria between human beings and other animals. Many use this information to justify some of the studies and experiments that use animals as subjects, such as the chimp raising studies like the one written about in Fowler’s we are all completely beside ourselves. However, Fowler’s character, Fern the chimp, displays the ability to remember pieces of her early life with the Cooke family, and reacts to multiple family members later on the novel. It is also no secret that animals who are rescued often show signs of PTSD, occasionally having flashbacks when put in situations that remind them about their life before rescue.

The experiment is as follows; one hundred students, randomly selected, participated in a context dependent memory experiment. twenty five were in each of the four following learn-recall situations; hot room-hot room, hot room-cold room, cold room-cold room, cold room-hot room. They were asked to spend thirty minutes learning a list of thirty words. The next day they were asked to recall those words in a fifteen minute time period. There are no results.

Since hippocampus plays an important function in the brain, it has become a great topic for many conducted research not only on human but also animals, specifically primates and rodents. In primate model of amnesia, the experiment is performed through three main tasks – delayed nonmatch to sample, object discrimination paradigm and motor skill learning across multiple trials (Eichenbaum et al, 1992). In delayed non-matching test, both amnesic and intact monkey show nearly same performance rate in remembering objects across delayed in short period of time (Eichenbaum et al, 1992). In contrast, amnesic monkeys show a great impairment for longer delayed conditions, hours, in picking the right non-matched samples (Eichenbaum et al, 1992). Likewise, in object discrimination task, amnesic monkeys are unable to recognize objects, as compared to control monkeys (Eichenbaum et al, 1992).These tests suggest the importance of hippocampus in acquisition of new information and recollection old events from episodic memory. Additionally, hippocampus also contributes largely to relational representation, as a characteristic of declarative memory (Eichenbaum et al, 1992). This can be shown through odor discrimination and place

Some scientists believe that parts of long term memory are permanent while others will eventually weaken over time. (3) Long term memory can be divided into three sections: procedural memory, declarative memory, and remote memory. Procedural memory includes motor skills such as learning how to ride a bike or how to drive a car. "Such memories are slow to acquire but more resistant to change or loss." (4) Declarative memory is used to remember facts, such as names, dates and places. It is easy to learn but also easy to lose. Finally there is episodic memory, which is the record of events that a person stores throughout his or her experience. Recent studies show that these events, as soon as they occur, are sent to a temporary part of the brain called the hippocampus, and that over time they are moved to the neocortex for permanent storage. (5).

Learning is a very important aspect of humans and creatures alike. Not only is it essential to the survival and adaption into this world but it also defines who we are as individuals (Schiller et al, 2010; Tronson & Taylor, 2007). Memories from past experiences shape the people that we are today. A crucial element to learning is memory, without it we would not be able to retain information. The process of memory is very distinct and consists of several different stages: acquisition of memory, consolidation, retrieval and then either reconsolidation or extinction (Debiec & Ledoux, 2004; Diergaarde, Schoffelmeer & De Vries, 2008). As memory is such a critical aspect of learning, it is no wonder that its distinct process has become the topic of much research in the neurobiological universe (Hupbach et al, 2007; Nader & Hardt, 2009).

Prior to the early 1970s the prominent idea of how memories were formed and retrieved revolved around the idea of processing memory into specific stores (Francis & Neath, 2014). These memory stores were identified as sensory memory, short-term memory, and long-term memory. In contrast to this idea, two researchers named Fergus Craik and Robert Lockhart proposed an idea linking the type of encoding to retrieval (Goldstein, 2015). This idea is known as the levels of processing theory. According to this theory, memory depends on the depth of processing that a given item is received by an individual (Goldstein, 2015). Craik and Lockhart stressed four points in supporting their theory. First, they argued that memory was the result of a series of analyses, each level of the series forming a deeper level of processing than the preceding level (Francis & Neath, 2014). The shallow levels of processing were believed to hold less importance and are defined as giving little attention to meaning of an item. Examples of which include focusing on how a word sounds or memorizing a phone number by repeating it over and over again (Francis & Neath, 2014) (Goldstein, 2015). The deeper levels processing involve paying close attention to the meaning of an item and relating that meaning to something else, an example of which would be focusing on the meaning of a word rather than just how the word sounds (Francis & Neath, 2014) (Goldstein, 2015). The second point Craik and Lockhart

Memory makes us. It is, to an extent, a collection of unique and personal experiences that we, as individuals, have amassed over our lifetime. It is what connects us to our past and what shapes our present and the future. If we are unable remember the what, when, where, and who of our everyday lives, our level of functioning would be greatly impacted. Memory is defined as or recognized as the “sum or total of what we remember.” Memory provides us the ability to learn and adjust to or from prior experiences. In addition, memory or our ability to remember plays an integral role in the building and sustaining of relationships. Additionally, memory is also a process; it is how we internalize and store our external environment and experiences. It entails the capacity to remember past experiences, and the process of recalling previous experiences, information, impressions, habits and skills to awareness. It is the storage of materials learned and/or retained from our experiences. This fact is demonstrated by the modification, adjustment and/or adaptation of structure or behavior. Furthermore, we as individuals, envision thoughts and ideas of the present through short-term memory, or in our working memory, we warehouse past experiences and learned values in long-term memory, also referred to as episodic or semantic memory. Most importantly, memory is malleable and it is intimately linked to our sense of identity and where we believe we belong in the world.