MEMORY Pertemuan 10 Matakuliah: L0014 / Psikologi Umum Tahun: 2007

BINA NUSANTARA2 MEMORY THREE STAGES OF MEMORY FORGETING AND WHY IT OCCURS BIOLOGICAL BASIS OF MEMORY

BINA NUSANTARA3 DEFINITION memory is an organism's ability to store, retain, and subsequently retrieve information

BINA NUSANTARA4 PROCESS Encoding or registration (processing and combining of received information) Encoding Storage (creation of a permanent record of the encoded information) Storage – Stages theory of memory : a model of memory based on the idea that we store information in three separate but linked memory Sensory Register Short Term Memory Long Term Memory Retrieval or recall (calling back the stored information in response to some cue for use in a process or activity) Retrieval

BINA NUSANTARA5 Stage model of memory Sensory input Sensory register Short Term MemoryLong Term Memory Forgetting Rehearsal

BINA NUSANTARA6 STAGES THEORY OF MEMORY Sensory Register (1) The first stages of memory, in which an exact image of each sensory experience is held briefly until it can be processed The ability to look at an item, and remember what it looked like with just a second of observation, or memorization Characteristics : – corresponds approximately to the initial milliseconds after an item is perceived – A complete replica of the sensory experiences : For visual information : lasting about 1/4 of a second For auditory information : a vivid image of what we hear is retain about 1/4 of a second, but a weaker echo is retained for up to 4 seconds

BINA NUSANTARA7 Research by George Sperling (1960) "partial report paradigm” Subjects were presented with a grid of 12 letters, arranged into three rows of 4. After a brief presentation (1/20 seconds), subjects were then played either a high, medium or low tone, cuing them which of the rows to report. Sperling was able to show that the capacity of sensory memory was approximately 12 items, but that it degraded very quickly (within a few hundred milliseconds). Because this form of memory degrades so quickly, participants would see the display, but be unable to report all of the items (12 in the "whole report" procedure) before they decayed. This type of memory cannot be prolonged via rehearsal. STAGES THEORY OF MEMORY Sensory Register (2)

BINA NUSANTARA8 STAGES OF MEMORY Short Term Memory – STM (1) The 2 nd stage of memory, in which five to nine bits of information can be stored for brief periods of time Short-term memory allows one to recall something from several seconds to as long as a minute without rehearsal, Its capacity is also very limited George A. Miller, when working at Bell Laboratories, conducted experiments showing that the store of short term memory was 7  2 items (the title of his famous paper, "The magic number 7  2"). George A. Miller Modern estimates of the capacity of short-term memory are lower, typically on the order of 4-5 items Two important examples of STM control processes : Rehearsal Chunking

BINA NUSANTARA9 STAGES OF MEMORY STM – REHEARSAL (2) Rehearsal is mental repetition of information to retain it longer in STM Research by Lloyd and Margaret Peterson (1959) single combination of three consonants counting backwards (intervals 0 – 18 seconds) LRP   recall LRP

BINA NUSANTARA10 STAGES OF MEMORY STM – CHUNKING (3) The memory capacity can be increased through a process called chunking. For example, if presented with the string: FBIPHDTWAIBM People are able to remember only a few items. However, if the same information is presented in the following way: FBI PHD TWA IBMFBIPHDTWAIBM people can remember a great deal more letters. This is because they are able to chunk the information into meaningful groups of letters. Beyond finding meaning in the acronyms above, Herbert Simon showed that the ideal size for chunking letters and numbers, meaningful or not, was three.Herbert Simon This may be reflected in the tendency to remember phone numbers as several chunks of three numbers with the final four-number groups generally broken down into two groups of two.

BINA NUSANTARA11 LONG TERM MEMORY - LTM (1) The 3 rd stage of memory, involving the storage of information that is kept for long periods of time can store much larger quantities of information for potentially unlimited duration (sometimes a whole life span). LTM vs. STM 1. The way which information is recalled – using cues 2. The form in which information is stored in memory – meaning or semantic codes 3. The reasons that forgetting occurs 4. The physical location of these functions in the brain – STM : frontal lobes, cerebral cortex – LTM : integrated in Hippocampus, then transferred to the areas of the cerebral cortex involved in language and perception for permanent storage

BINA NUSANTARA12 LONG TERM MEMORY – LTM (2) TYPES Declarative Memory requires conscious recall, in that some conscious process must call back the information. It is sometimes called explicit memory, since it consists of information that is explicitly stored and retrieved. consciousrecall explicit memory Declarative Memory Semantic Memory Episodic Memory Procedural Memory Procedural Memory is not based on the conscious recall of information, but on implicit learning. Procedural memory is primarily employed in learning motor skills and should be considered a subset of implicit memory. It is revealed when we do better in a given task due only to repetition - no new explicit memories have been formed, but we are unconsciously accessing aspects of those previous experiences. Procedural memory involved in motor learning depends on the cerebellum and basal ganglia. implicitunconsciouslymotor learningcerebellumbasal ganglia

BINA NUSANTARA13 Declarative memory can be further sub-divided into – semantic memory, which concerns facts taken independent of context semantic memory – episodic memory, which concerns information specific to a particular context, such as a time and place. episodic memory Semantic memory allows the encoding of abstract knowledge about the world, such as "Paris is the capital of France".knowledge Episodic memory, is used for more personal memories, such as the sensations, emotions, and personal associations of a particular place or time. Ex. Autobiographical memory LONG TERM MEMORY – LTM (3) TYPES : DECLARATIVE MEMORY

BINA NUSANTARA14 LONG TERM MEMORY – LTM (4) ORGANIZATION Make a story Associative network : memories are associated, linked together, through experience

BINA NUSANTARA15 RETRIEVAL Recall – A measure of memory based on the ability to retrieve information from long – term memory with few cues – Serial position effect : the finding that immediate recall of items listed in a fixed order is often better for items at the beginning and end of the list that those in the middle – The tip of the tongue phenomenon Recognition – A measure of memory based on the ability to select correct information from among the options provided Relearning/savings – A measure of memory based on the length of time it takes to relearn forgotten material

BINA NUSANTARA16 RETRIEVAL (2) Serial learning – Serial position effect : The finding that immediate recall of items listed in a fix order is often better for items at the beginning and end of the list than for those in the middle – The first item – rehearsed enough time to transfer to LTM – The last/end item – still in STM The Tip of the Tongue phenomenon – Trying to recall a fact that we can almost remember – by cues

BINA NUSANTARA17 An alternative to stage model Elaboration – The process of creating associations between a new memory and existing memories

BINA NUSANTARA18 FORGETTING (1) Decay Theory – The theory that forgetting occurs as the memory trace fades over time – Happen in Sensory Register and STM Interference Theory – The theory that forgetting occurs because similar memories interfere with the storage or retrieval of information Proactive interference : interference created by memories from prior learning Retroactive interference : interference created by memories from later learning – Happen in LTM – semantic memory and STM

BINA NUSANTARA19 FORGETTING (2) Reconstruction (schema) Theory – The theory that information stored in the LTM sometimes changes over time to become more consistent with our beliefs, knowledge and expectation (schema) – False memory : remembering an event that did not occur or that occurred in a way that was substantially different from the memory of the event Theory of Motivated forgetting – Forgetting that is believed to be based on the upsetting or threatening nature of the information that is forgotten

BINA NUSANTARA20 MEMORY DISORDERS Amnesia : Loss of memory – Retrograde amnesia : a memory disorder characterized by an inability to retrieve old LTM, generally for a specific period of time extending back from the beginning of the disorder Caused by seizures, brain damage of various sorts, a blow to the head, highly stressful events – Anterograde amnesia Disorder in memory characterized by an inability to store and/or retrieve new information in LTM Not affect the LTM – procedural memory Korsakoff’s syndrome – A disorder involving both anterograde and retrograde amnesia caused by excessive use of alcohol Others : – Alzheimer's disease can also affect memory and cognition. Alzheimer's disease – Impaired memory can be a symptom of hypothyroidismhypothyroidism