Hierarchical structure of the autobiographical knowledge base
Writing in a diary
Happy emotions will strengthen a memory of an Olympic goal
Diagram of the different lobes of the brain

Autobiographical memory is a memory system consisting of episodes recollected from an individual's life, based on a combination of episodic (personal experiences and specific objects, people and events experienced at particular time and place) and semantic (general knowledge and facts about the world) memory.

- Autobiographical memory

An acute cortisol level (by injection) has been found to significantly inhibit the recall of autobiographical memories which may contribute to memory deficits found in depression.

- Episodic memory
Hierarchical structure of the autobiographical knowledge base

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Overall

Hippocampus as seen in red

Explicit memory

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One of the two main types of long-term human memory, the other of which is implicit memory.

One of the two main types of long-term human memory, the other of which is implicit memory.

Hippocampus as seen in red
Amygdala as seen in red
The Morris water maze

Explicit memory can be divided into two categories: episodic memory, which stores specific personal experiences, and semantic memory, which stores factual information.

Autobiographical memory is a memory system consisting of episodes recollected from an individual's life, based on a combination of episodic (personal experiences and specific objects, people and events experienced at particular time and place) and semantic (general knowledge and facts about the world) memory.

Overview of the forms and functions of memory.

Memory

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Faculty of the mind by which data or information is encoded, stored, and retrieved when needed.

Faculty of the mind by which data or information is encoded, stored, and retrieved when needed.

Overview of the forms and functions of memory.
Olin Levi Warner, Memory (1896). Library of Congress Thomas Jefferson Building, Washington, D.C.
The working memory model
The garden of oblivion, illustration by Ephraim Moses Lilien.
Regulatory sequence in a promoter at a transcription start site with a paused RNA polymerase and a TOP2B-induced double-strand break
Brain regions involved in memory formation including medial prefrontal cortex (mPFC)
Regulatory sequence in a promoter at a transcription start site with a paused RNA polymerase and a TOP2B-induced double-strand break

Under declarative memory resides semantic and episodic memory.

Autobiographical memory – memory for particular events within one's own life – is generally viewed as either equivalent to, or a subset of, episodic memory.

Hermann Ebbinghaus

Recall (memory)

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Recall in memory refers to the mental process of retrieval of information from the past.

Recall in memory refers to the mental process of retrieval of information from the past.

Hermann Ebbinghaus
Cerebellum highlighted in red
Globus pallidus highlighted in red
Hippocampus highlighted in red
Anterior cingulate cortex
A visual representation of Spreading Activation
Jorge Luis Borges in 1951

Tulving described episodic memory as a memory about a specific event that occurred at a particular time and place, for example what you got for your 10th birthday.

Until recently, research on this phenomenon has been relatively rare, with only two types of involuntary memory retrieval identified: involuntary autobiographical memory retrieval, and involuntary semantic memory retrieval.

Humans have two hippocampi, one in each hemisphere of the brain. They are located in the medial temporal lobes of the cerebrum. In this lateral view of the human brain, the frontal lobe is at the left, the occipital lobe at the right, and the temporal and parietal lobes have largely been removed to reveal one of the hippocampi underneath.

Hippocampus

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Major component of the brain of humans and other vertebrates.

Major component of the brain of humans and other vertebrates.

Humans have two hippocampi, one in each hemisphere of the brain. They are located in the medial temporal lobes of the cerebrum. In this lateral view of the human brain, the frontal lobe is at the left, the occipital lobe at the right, and the temporal and parietal lobes have largely been removed to reveal one of the hippocampi underneath.
Image 1: The human hippocampus and fornix (left) compared with a seahorse (right)
Image 2: Cross-section of cerebral hemisphere showing structure and location of hippocampus
Image 3: Coronal section of the brain of a macaque monkey, showing hippocampus (circled)
Image 4: Basic circuit of the hippocampus, as drawn by Cajal DG: dentate gyrus. Sub: subiculum. EC: entorhinal cortex
Image 5: Hippocampal location and regions
Rats and cognitive maps
Image 6: Spatial firing patterns of 8 place cells recorded from the CA1 layer of a rat. The rat ran back and forth along an elevated track, stopping at each end to eat a small food reward. Dots indicate positions where action potentials were recorded, with color indicating which neuron emitted that action potential.
Image 7: Examples of rat hippocampal EEG and CA1 neural activity in the theta (awake/behaving) and LIA (slow-wave sleep) modes. Each plot shows 20 seconds of data, with a hippocampal EEG trace at the top, spike rasters from 40 simultaneously recorded CA1 pyramidal cells in the middle (each raster line represents a different cell), and a plot of running speed at the bottom. The top plot represents a time period during which the rat was actively searching for scattered food pellets. For the bottom plot the rat was asleep.
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Image 9: An EEG showing epilepsy right-hippocampal seizure onset
Image 10: An EEG showing epilepsy left-hippocampal seizure onset
Image 11: Drawing by Italian pathologist Camillo Golgi of a hippocampus stained using the silver nitrate method
thumb|Hippocampus highlighted in green on coronal T1 MRI images
thumb|Hippocampus highlighted in green on sagittal T1 MRI images
thumb|Hippocampus highlighted in green on transversal T1 MRI images

Over the years, three main ideas of hippocampal function have dominated the literature: response inhibition, episodic memory, and spatial cognition.

Psychologists and neuroscientists generally agree that the hippocampus plays an important role in the formation of new memories about experienced events (episodic or autobiographical memory).

Santa Cruz's historic Pacific Garden Mall suffered severe damage during the 1989 Loma Prieta earthquake

Flashbulb memory

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Vivid, long-lasting memory for the circumstances surrounding the reception of news about a surprising or shocking event.

Vivid, long-lasting memory for the circumstances surrounding the reception of news about a surprising or shocking event.

Santa Cruz's historic Pacific Garden Mall suffered severe damage during the 1989 Loma Prieta earthquake
Amygdala highlighted in red

Flashbulb memories are one type of autobiographical memory.

Generally speaking, studies testing differences between genders on episodic memory tasks revealed that "women consistently outperform men on tasks that require remembering items that are verbal in nature or can be verbally labeled" (Herlitz, 2008).

Lifespan retrieval curve

Reminiscence bump

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Tendency for older adults to have increased or enhanced recollection for events that occurred during their adolescence and early adulthood.

Tendency for older adults to have increased or enhanced recollection for events that occurred during their adolescence and early adulthood.

Lifespan retrieval curve

It was identified through the study of autobiographical memory and the subsequent plotting of the age of encoding of memories to form the lifespan retrieval curve.

The impaired functioning of autobiographical memory due to damage or disease can have profound effects on an individual's episodic memory.

Emotion and memory

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Emotion can have a powerful effect on humans and animals.

Emotion can have a powerful effect on humans and animals.

Numerous studies have shown that the most vivid autobiographical memories tend to be of emotional events, which are likely to be recalled more often and with more clarity and detail than neutral events.

Studies have shown that as episodic memory becomes less accessible over time, the reliance on semantic memory to remember past emotions increases.

Childhood amnesia

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Childhood amnesia, also called infantile amnesia, is the inability of adults to retrieve episodic memories (memories of situations or events) before the age of two to four years, as well as the period before the age of ten of which some older adults retain fewer memories than might otherwise be expected given the passage of time.

Infants can remember the actions of sequences, the objects used to produce them, and the order in which the actions unfold, suggesting that they possess the precursors necessary for autobiographical memory.