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Memory and brain mechanisms
Hippocampus function
Hippocampus function
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The dual process theory suggests that there are two different modes of processing (Evans, 2008). This theory and its components have been debated across many fields of psychology; including cognitive, social, as well as the neuroscience field. The dual process theory suggests that there are two types of thinking; one fast and intuitive, while the second is slow and deliberative (Evans & Stanovich, 2013). Both types of thinking have a variety of definitions that are used throughout research including reflexive and impulsive for the first type of thinking, with reflective and controlled being used for the second type of thinking (Lieberman, 2003; Strack & Deustch, 2004; Schneuider & Schiffrin, 1977). This theory has been met with some criticism, with researchers arguing that a dual system …show more content…
I am interested in the role of this dual process theory in the field of neuroscience; specifically with regards to the hippocampus and memory. In the neuroscience field, there is a general consensus that there are two distinct operations that occur during memory tasks; recollection and familiarity. Recollection is defined as consciously remembering an experience (Mandler, 1980), and familiarity is defined as the feeling of a previous encounter with the stimulus without any other details (Tulving, 1985). The debate lies in deciding whether these two processes are mediated by specific circuits, or whether they are mediated by a more declarative memory system (Turriziani et al., 2008). The debate focuses on the role of the medial temporal lobe, which includes the hippocampal formation, as well as the entorhinal, perihinal and parahipocampal cortices (Squire & Zola-Morgan, 1991). Supporters of the dual-process theory claim that the hippocampus is primarily useful for
Min, K. J., Hyun, K. D., Lee, Y., Jin, P. S., & Hoon, R. J. (2014). Distinct roles of the hippocampus
Over the years, memory have been researched and debated, however there are two theories that have explained extensively and are highly recognised by psychologist in the cognitive field of psychology and scientist alike, on how we process experiences and turn them into memories. These theories include the Atkinson and Shiffrin (1968) Multi-store Model of Memory and Baddeley and Hitch (1974) Phonological Loop Model of Memory. This essay aims to compare, contrast and evaluate these models of memory, with supporting evidence and empirical research.
The brain has four major lobes. The frontal lobe, the parietal lobe, the occipital lobe, and temporal lobe are responsible for all of the activities of the body, from seeing, hearing, tasting, to touching, moving, and even memory. After many years of debating, scientist presents what they called the localization issue, Garret explains how Fritsch and Hitzig studied dog with conforming observations, but the cases of Phineas Gage’s accident in 1848 and Paul Broca’s autopsy of a man brain in 1861 really grabbed the attention of an enthusiastic scientific community (Garret 2015 p.6)
According to these two cases, these inspire us to understand that the hippocampus is an important brain region that is used for converting short-term memory into long-term memory.
The second stage of memory processing is storage. Aronson et al. (2013) defines storage as the process by which people store the information they just acquired. Unfortunately, memories are affected by incoming information through alteration or reconstruction. This phenomenon is referred to as recon...
Historically, cognitive psychology was unified by an approach based on an resemblance between the mind and a computer, (Eysenck and Keane, 2010). Cognitive neuroscientists argue convincingly that we need to study the brain while people engage in cognitive tasks. Clearly, the internal processes involved in human cognition occur in the brain, and several sophisticated ways of studying the brain in action, including various imaging techniques, now exist, (Sternberg and Wagner, 1999, page 34).Neuroscience studies how the activity of the brain is correlated with cognitive operations, (Eysenck and Keane, 2010). On the other hand, cognitive neuropsychologists believe that we can draw general conclusions about the way in which the intact mind and brain work from mainly studying the behaviour of neurological patients rather than their physiology, (McCarthy and Warrington, 1990).
The question then becomes whether declarative and non-declarative memory are in fact separate or different manifestations of the same neural process. From research on H.M., we find evidence for the existence of a declarative memory system that is independent of non-declarative memory and other forms of intelligence. H.M. had the capacity to hold information in his head for a period of time, suggesting that his working memory was intact (Squire and Wixted, 2011). Further evidence that not all memory is the same is the fact that H.M. acquired a motor skill despite not being able to remember actually learning the skill, thus showing the difference between episodic and semantic memory. Amnesiacs are able to acquire the perceptual skill of reading mirror-reversed words at a normal rate compared to controls (Cohen and Squire, 1980), demonstrating that the ability to learn new perceptual skills also remains intact. Of the forms of non-declarative memory, procedural memory involves the cerebellum, motor cortex, and basal ganglia (General Intro the Neurobiology…). Thus, non-declarative memory can, in a way, be seen as a more primitive form of memory that is not acquired through the integration and consolidation of neural events in the medial temporal lobe, but rather through learned associations outside of the
Making and storing memories is a complex process involving many regions of the brain. (3). Most experts agree that we have two stages of memories - short-term memory and long-term memory. Short-term memory is the immediate memory we have when we first hear or perceive someth...
Caramazza, A., & Coltheart, M. (2006). Cognitive Neuropsychology twenty years on. Cognitive Neuropsychology, Vol. 23, pp. 3-12.
Hippocampus plays an important job in the formation of new memories about experienced events such as the episodic or the autobiographical memory. It is also a part of larger medial temporal lobe memory system responsible for general declarative memory. General declarative memory is a type of memories that can be explicitly verbalized. If damage to hippocampus occurs only in one hemisphere, our brain can still retain near-normal memory functioning. But even so the hippocampus is damage; some types of memory such as abilities to learn new skills will not be affected. The reason is because, some abilities depends on different types of memory and different regions of the brain such as procedural memory. Hippocampus also plays role in spatial memory and navigation. Many hippocampal neurons have “place fields” and the discovery of place cells in 1970’s led to the theory that hippocampus might act as cognitive
“Maturation of the Prefrontal Cortex.” Office of Population Affairs, n.p. N.d. Web. 17 February 2012.
Frontal Lobe Syndrome Although volumetrically the frontal lobes are the largest portion of the brain their function remains somewhat elusive (Jacobs, 2005). Even neuropsychologists have a difficult time creating test that accurately test frontal lobe functioning. We do know however, that the frontal lobes are involved in the storage of memories, concentration, abstract thought, judgment, and self control. The frontal lobe lies directly behind our forehead (NINDS, 2005)
Tulving, E. and Craik, F. (2000) The Oxford handbook of memory. Oxford: Oxford University Press.
Wheeler, M. A., Stuss, D, t., & Tulving, D. (1997). Toward a theory of episodic memory: The frontal lobes and autonoetic consciousness: Psychological Bulletin, 121, 331-354
Jerome S. B. , Goodnow J. J. and Austin G.A. (1967) Overview ( p.231-247):In A study of thinking . John Wiley and Sons Ltd, USA