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FORGETTING Inability to retrieve information previously stored in LTM Theories of forgetting (retrieval failure, interference theory, motivated forgetting, decay) The features of the forgetting curve as ( the contribution of proactive and retroactive interference effects in recall) Organic causes of forgetting (amnesia both anterograde and retrograde) Memory decline over the lifespan Memory enhancement though quality of encoding (organisation) and the use of context dependent cues, state dependent cues and mnemonic devices (narrative chaining and method of loci) Theories of Forgetting Retrieval Failure Theory: Suggests that many memories are inaccessible because memory cues that were present when the memory was formed are missing when the time comes to retrieve it Tip-of-the-tongue (TOT) phenomenon: Having the answer on the tip of your tongue, you know the answer is there but it is just out of reach Theories of Forgetting Retrieval Failure Theory: Suggests that many memories are inaccessible because memory cues that were present when the memory was formed are missing when the time comes to retrieve it Tip-of-the-tongue (TOT) phenomenon: Having the answer on the tip of your tongue, you know the answer is there but it is just out of reach Retrieval Cues Any piece of information that aids the retrieval of information stored in LTM Experiment Look at the list of words. Provide three words for each word that somehow relate to that word. Place you name on your piece of paper and hand it to the teacher. Interference Theory The tendency for new memories to impair the retrieval of older memories and vice versa Proposes that forgetting in LTM results from other memories interfering with the retrieval of information targeted for recall, especially when memories are similar Types of Interference Retroactive Interference: Refers to the tendency for new information to interfere with the retrieval of previously learned information (think: retro = backward) Proactive Interference: Refers to the tendency for previously learned information to interfere with the retrieval of recently learned information (think: proactive = forward) Motivated Forgetting Forgetting in LTM occurs because of a conscious or unconscious desire to block out painful or threatening memories Repression: Occurs unconsciously or without your awareness Suppression: When you actively and consciously attempt to put something out of awareness – you could choose to remember it Limitations to Motivated Forgetting Has not been extensively tested in laboratory Other factors could account for memory loss such as a blow to the head or lack of consolidation Decay Theory Assumes that when learning takes place a change occurs in the brain – a memory trace is formed (physical/chemical trace of the event) Decay theory suggests that these traces disintegrate over time if they are not reactivated for use - Only relevant to LTM Limitations of Decay Theory Fails to explain why some memories fade and others are maintained for life Doesn’t explain our ability to recover seemingly forgotten memories – this can happen through re-learning or a retrieval cue The Forgetting Curve There is a normal curve for forgetting new information Hermann Ebbinghaus did experiment on himself using nonsense syllables - After 20 mins he remembered 70% - After 1 hour her remembered 54% - After 1 day he remembered 38% - After 2 days he remembered 28% - After a month remembered 21 Forgetting Curve Rate and Amount of Forgetting Curve is generally the same for a variety of materials but can vary Semantic memories tend to be lasting More meaningful information is also forgotten less easily How well information is encoded influences rate and amount of forgetting – not affected by difficulty of information Organic Causes of Forgetting When damage to the brain causes abnormal functioning it is said to be organic eg: blow to head, stroke, tumour – these can lead to amnesia, a common form of memory loss http://www.youtube.com/watch?v=WmzU47i2xgw&feature=related Amnesia: temporary or permanent, partial or complete loss of memory - Organic = caused by damage to brain - Dissociative = psychological trauma Amnesia: Anterograde Amnesia Brain damage or trauma that causes memory loss for events occurring AFTER the amnesia (antero = forward) Sufferers are able to retrieve LTM’s but are unable to form new ones Extent of amnesia depends on the extent of the injury Amnesia: Retrograde Amnesia Memory loss for events occurring BEFORE the amnesia (retro = backward) Sufferers are unable to remember events or information related to the past but are able to form new memories Alzheimers Disease Permanent, progressive and debilitating form of dementia that results from organic brain decay Serious and permanent loss of intellectual capacity that results in confusion and loss of memory – especially for episodic and semantic memories Considered to be age-related, but not always - Read more on pages 256/257 Memory Decline over Lifespan People remember more between the ages of 10 and 30 – why? - We experience new things - Physical abilities are high Young adults have better recall but recognition doesn’t decline with age Age results in more errors in recalling meaningless information Episodic memories more affected by age Attitude affects memory recall in older people Memory Enhancement Information not properly encoded is more easily forgotten Organising new information by connecting it to LTM’s increases retrieval chances Attending to information ensures it will not be lost Quality of encoding: Shallow: physical structure, Moderate: acoustic/phonetic qualities, Deep: links new to old Retrieval Cues Encoding specificity principle: the more closely retrieval cues match original condition the greater the chance of recall Context-dependent cue: Our physical surroundings during the learning State-dependent cue: The bodily state that exists during learning Mnemonic Devices Any kind of memory system or aid - Imagery: mental representations or mental picture of something - Mental association: creating connections between new and LTM’s - Narrative chaining: links unrelated items to create a sequence of meaningful information - Method of Loci: Mentally linking a serious of locations to information that needs to be recalled
