lesson 16 Flashcards
Long-Term Memory
long-lasting representation of information
LTM involves
Involves stores with wide capacity –> virtually unlimited and can store information for virtually the whole life
LTM is highly
organized
Retrieval deficits can be due to
Loss of information (proper memory loss)
Difficulty in finding them (strategic deficit
difficulties in ____________ can be _________
Difficulties in declarative/explicit (conscious) and in non-declarative/implicit (unconscious) memories can be dissociated
Implicit/Non-declarative is tested with
Tested with implicit/incidental tasks (no explicit reference to previous learning)
Learning means
a change in behavior –> exposure/practice is not enough
procedural memory
executive system working at unconscious level that participates in recalling motor and executive skills necessary to perform a task
stands for mechanical or motor-related skills
procedural memory - neuro correlates
basal ganglia, motor-related areas
when necessary, procedural memories are retrieved
automatically for use in the implementation of complex procedures related to motor and intellectual skills
Ex: riding a bike or reading
Procedural learning
systematical repetition of a complex activity until acquiring and automatizing the capacity of all neural systems involved in performing the task to work together
Priming
an effect whereby exposure to certain stimuli influences the response given to stimuli presented later (incidental learning, because subject is not aware)
means a higher probability of recognizing previously perceived information
priming - neural correlates
primary and assocation cortex
subjects are quick to respond to ______
Subjects are quicker to respond to words that have been primed with semantically related words
Associative memory
storage and retrieval of information through assocation with other information –> two types of conditioning: classical and operant
perceptual memory
refers to the recognition of the stimuli and is related to familiarity judgements
perceptual memory neural correlates
posterior sensory cortex
Classical conditioning
associative learning between stimuli and behavior
Operant condition
form of learning in which new behaviors develop in terms of their consequences
‘Somatic’ conditioning
conditioning of the eye blind reflect after repeated presentation of a neutral stimulus (e.g. sound) following a puff in the eye –> role of cerebellum
“somatic’ conditioning - neural correlates
cerebellum
‘Emotional’ conditioning
type of learning in which an association is established between a neural stimulus and a negative, unpleasant event, thus leading to fear of the neutral stimulus
‘emotional’ conditioning neural correlates
Role of amygdala –> emotional responses are often preserved in amnesic patients
what type of response are often preserved in amnesic patients
emotional responses
example of ‘emotional’ conditioning
Ex: John Watson’s little Albert experiment
Non-associative memory
newly learned behavior through repeated exposure to an isolated stimulus
New behaviors classified into two processes
sensitization and habituation operation mechanism
Habituation
linked to repetition –> repetition of a stimulus leads to a decrease in its response
Sensitization
increase in response to a stimulus due the repeated introduction thereof
Patients with deficits in implicit LTM
Parkinson’s disease, Huntington’s disease, dementia
similarities and differences between episodic and semantic memory
Episodic and semantic memory are both part of declarative memory, but are PHENOMENOLOGICALLY different – conscious retrieval and the result of learning is a memory
a memory
conscious retrieval and the result of learning
Semantic memory
knowing; memories for facts/notions/concepts and vocabular, organized according to logical (not temporal) criteria
semantic memory can constitute
Can constitute general or specific, conceptual or encyclopedic knowledge without a personal connotation –> context free
semantic memory atrophy =
Atrophy in anterior part of the temporal lobe (temporal pole) and lateral-inferior areas
Episodic memory
remembering; semantic memories placed in a specific context (i.e., in a sequence, with a location, time and emotional association); they are events, facts, experiences, with a personal connotation = my memory, my story
Retrograde
past events
anterograde
new learnings
episodic memory atrophy =
Atrophy in mesial temporal cortex
Semantic and episodic interact in
Semantic and episodic interact in new learnings;
new knowledge is episodic at beginning of process
but with time and continuous recall it becomes semantic and redundant
new knowledge is ___ at the beginning but with time and continuous recall it becomes _____
new knowledge is episodic at beginning of process but with time and continuous recall it becomes semantic and redundant
episodic and semantic memory - clinical point of view
May be dissociated from a clinical point of view –> intact episodic memory, but loss of knowledge about concepts, objects, people, facts, and the meanings of words (semantic deficit)
episodic memory and time
dependent
episodic memory and recollection
mostly voluntary
episodic memory and encoding
strategic
episodic memory and storage
visual/semantic
episodic memory and significance
operational
semantic memory and time
independent
semantic memory and recollection
mostly automated
semantic memory and encoding
features mediated
semantic memory and storage
amodal or modality specific
semantic memory and significance
propositional
Semantic memory =
our ‘encyclopedia’
semantic memory includes
Includes notions/concepts that are organized
semantic memory is independent of
Independent of spatial and temporal coordinates regarding where and when learning took place
semantic memory according to two criteria
associations and taxonomies
Concept (or semantic) representations
distributed representations incorporating defining groups of features –> reflect patterns of engagement of neural networks in associative cortices, where knowledge is stored as synaptic connection strengths
concept representations - From a theoretical point of view, these distributed representations are constituted by
nodes and links
The distance between nodes represents
the similarity between items (closer = more similar, vice versa)
Each concept is defined by the links
with other concepts
Hierarchical Semantic Network Model
proposed on the results of experimental studies in healthy subjects (HS)
nodes
items stored in semantic memory
Hierarchical Semantic Network Model - the nodes can be divided between
superordinate and basic-level (subordinate) concepts
Hierarchical Semantic Network Model - Each concept is associated with
some features (e.g., the canary can sing, is yellow, is a bird so it has wings…)
Hierarchical Semantic Network Model - cognitive economy
the information is stored as to eliminate redundancy (a property characterizing a particular class of things is assumed to be stored only at the place in the hierarchy that corresponds to that class)
Performances in tasks as semantic fluency or reaction times when answering questions
Spreading activation model
proposed based on the results of experimental studies in HS
is a non-hierarchical model
Non-hierarchical model
the length of the link indicates the relationship between concepts –> shorter the link, the faster the co-activation
Non-hierarchical model - The activation of a node/link produces a
The activation of a node/link produces a partial activation of all connected nodes (spreading activation), which depends on teh strength of the association and direction –> the stronger the link, the faster the co-activation
Non-hierarchical model - The spreading activation
decreases with time
Model Based on Semantic Features
Proposed based on teh results of experimental studies in HS
Model based on semantic features: meaning of concepts is defined by a list of attributes
Model Based on Semantic Features is very different from
Very different from the idea of hierarchial/non-hierarchical networks
No cognitive economy
Atrophy in neural structures crucial for semantic memory
anterior part of temporal lobe (temporal pole and inferior-lateral areas)
semantic memory atrophy symptoms
impoverished knowledge of objects and people, impaired semantic sorting, reduced category (or semantic) fluency, impaired spoken and reading comprehension, severe anomia in everyday life (spontaneous language) and naming tests
what is spared with semantic memory atrophy
perceptual skills (posterior temporal and occipital cortices are not damaged), non-verbal problem solving, grammatic and phonological functions (language), episodic memory
question about embodiment with semantic knowledge
Is the nature of semantic knowledge embodied or unembodied?
Embodied cognition
concepts can (weak version) / have to (strong version) be presented in the motor and/or sensory system
Cognition in organized in such a way that it mirrors perception and action
Unembodied cognition
concepts are abstract/symbolic entities that are unrelated to sensory and/or motor information
Unitary content hypothesis
semantic knowledge is stored in an abstract, amodal format, and organized based on categories