Title: Acquired Neurological Language Disorders HCSNet SummerFest 2006 Prof Helen Chenery
1Acquired Neurological Language Disorders HCSNet
SummerFest 2006 Prof Helen Chenery
Rules of Engagement1. Sit next to a
stranger!2. Introduce yourself.
2Learning Objectives
- What has a knowledge of psycholinguistics
- contributed to our understanding of ANLD?
2. What have advances in our understanding of
brain/behaviour relationships brought to ANLD?
3. What has new research contributed to our
understanding and management of people with
ANLD?
4. What have the knowledge and skills from other
disciplines contributed to our understanding of
ANLD?
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4Course Structure
- I will address each of these collaborations with
reference to a person who has sustained
neurological damage. - A person with nonfluent aphasia
- A person with Parkinsons disease
- A person with schizophrenia
- A person with dementia
5A person with nonfluent aphasia
- Meet Gerry, a 75 year old man who suffered a left
hemisphere stroke 16 months ago and has aphasia.
conversation
Group Task With your partner, answer the
following questions?
6Structured Observation in Aphasia
- Is Gerrys language production fluent or
nonfluent? - What severity level is his aphasia?
- Are there any paraphasic errors (words that are
substituted for others)? If so, give examples. - What is Gerrys articulation like?
- Can Gerry understand everything that is said to
him? - Does Gerry have word finding difficulties?
- Are memory problems causing Gerry to be unable to
speak?
7The big questions!
- What has gone wrong as a result of the stroke and
how can we help Gerry recover his language? - Firstly, what does psycholinguistics contribute?
Group Task How can we describe Gerrys language?
Picture description
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10Agrammatism
- Entails the dropping out of articles, connective
words, auxiliaries and inflections so that
grammar may, in extreme cases, be reduced to
rudimentary form - the use of one or two words
sentences. - Yes ah Monday er Dad and Peter H (patients
name), and Dad er hospital and ah Wednesday
Wednesday, nine oclock and oh Thursday ten
oclock, ah doctors two an doctors and er
teethyah - (Goodglass Geschwind, 1976)
- Can a theory of normal sentence production help
us to understand Gerrys language deficits?
11Garretts sentence production model
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13Thematic role assignment and Predicate-argument
structure
- Verb Kiss
- Implies that someone is doing the kissing
(agent) and someone is being kissed
(recipient/theme) - Verb Deliver
- Implies that someone (agent) is doing the
delivering (agent), that some kind of item
(theme) is being delivered, and that someone is
receiving the delivery (recipient)
14- Verb Delivered
- Implies
- agent theme recipient
- John delivered the guns to the military base
- The choice of a particular verb commits a speaker
to specify the persons or objects related to the
thematic roles associated with that verb.
15- Where do these errors come from?
- She offered him some cake.
- He offered her some biscuits.
- He offered her some dake.
- He threw some cake at her.
-
16Disturbances affecting the realisation of
Thematic Roles in Agrammatism
- disturbance has been said to affect the patients'
ability to use the basic word order of English to
convey propositional features such as thematic
roles. - Saffran, Schwartz and Marin (1980) analysed 5
agrammatic aphasics describing simple pictures of
actions.Used actions and locatives of like and
contrasting animacy, e.g.,
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18Aphasic responses
- Target
- a key is in a suitcase
- a chair is on a car
- a boy is pulling a baby
- a man is washing a baby
- Aphasic response
- the luggage .. The key is the luggage. The key
is in the luggage - Automobile is The chair isthe chair was
under the car. - The boy and girl was falling down.
- Washing bath me.. boy .. boy.bath
19Results
- Found that AA could not with any consistency
produce NP-V-NP orderings that reflected
underlying semantic roles. - Most errors occurred for both animate actions and
both inanimate locations.
20- noted a strong effect of animacy upon the
position of nouns around the verbs - suggested that thematic roles were not mapped
onto the canonical noun-verb-noun word order of
English, and that animacy determined the position
of nouns around verbs in these patients. - Concluded that AA have either lost the basic
linguistic notions of thematic roles (gent, theme
etc) or else cannot use even basic word order of
the language to express this sentential semantic
feature. - Possible that some very severe patients lose
these concepts or do not attempt to convey them.
21Also linked to difficulty in producing verbs
- Many AA have particular difficulties with the
production of verbs. - Not only ties to trouble in producing the correct
inflectional and derivational forms of a verb in
a given context, also affect ability to produce
verbs themselves, resulting in omissions,
paraphasias, and nominalisations of verbs
22Examples of errors affecting the production of
verbs
- Patient attempts to describe the picture of a
girl presenting flowers to a teacher - Omission of main verbs
- The young the girl the little girl is the
flower. - The girls is .. Going to flowers.
- Nominalizations used instead of verbs
- The girl is flower the woman.The girl is is
roses. The girl is rosin. - Picture of a man taking a photograph of a girl
- The man kodaks and the girlkodaks the girl.
- from Badecker and Caramazza (1985)
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24Verb retrieval - Gordon Dell (2003)
INPUT LAYER Semantic Syntactic
Determiner Noun
Verb Motion
Air
OUTPUT LAYER Lexical items The boy go The bird
fly
25Verb retrieval - Gordon Dell (2003)
INPUT LAYER Semantic Syntactic
Determiner Noun
Verb Motion
Air
OUTPUT LAYER Lexical items The boy go The bird
fly
Weaker input
Lesion of syntactic input
26Verb retrieval - Gordon Dell (2003)
INPUT LAYER Semantic Syntactic
Determiner Noun
Verb Motion
Air
OUTPUT LAYER Lexical items The boy go The bird
fly
Weaker input
Lesion of semantic input
27Verb retrieval in nonfluent aphasia
- Barde et al. (2006)
- Examined verb retrieval in agrammatic and
non-agrammatic aphasics - Worse retrieval of simple verbs relative to
complex verbs was only evident in the group of
agrammatic aphasic patients. - Results confirm weakened syntactic input for verb
retrieval in non-fluent aphasia
28Approaches to therapy?
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30Mapping Therapy Byng et al. (Stage 1)
- Present two pictures
- Stan washing the dishes/Mary washing the dishes
- Patient selects a picture
- Four cards with phrases on are presented
- Each phrase has a coloured line below it denoting
its syntactic class (e.g., red for noun phrases
and green for verbs)
31Mapping therapy (Stage 1)
- Three lines, one red, one green and another red
are also drawn in that order on a blank card. - The patient has to identify the roles played by
the entities involved in the event and then
select the phrases which describe those entities. - Start with non-reversible events.
- Repeat the process for the second picture. Ask
patient to identify which part of the sentence
has been changed. - Then move on to contrasts between change of
agent, action, and theme/patient (use different
stimuli) - Repeat each set of stimuli with, and then
without, the colour cues.
32Mapping Therapy (Byng et al., 1994) Stage 2
- Use stimulus cards from previous therapy and ask
patient to describe the picture within a
structured format. - Give the patient a cue consisting of three
horizontal lines representing the three
constituent phrases of a possible sentence, and
ask patient to describe the components within
this sentence frame. Having produced any lexical
item, patient is asked to identify where in the
sentence frame that item should go.
33Computer based delivery
- Beveridge et al. (2002) delivered mapping
therapy to patients via computer program. - 8 X 1 hour sessions
- comprising picture building or sentence building
tasks - minimal input from clinician
- Written sentence comprehension improved
- Treatment effects generalised to untreated
sentences - Some generalisation to spoken sentence
comprehension
34Verb production therapy
- Training of argument structure assignments
- (Schneider et al., 2003)
- 1) Picture shown to patient
- 2) Patient told This picture shows
- catch. It shows a man catching a ball.
- The man is the person doing the
- catching, the ball is the thing
- being caught
- 3) Process repeated for other pictures.
- 4) Patient shown all pictures again and asked to
describe them.
35Functional Neuroimaging
-
time (seconds)
Deoxy
Oxy
- Functional magnetic resonance imaging
36Neuroimaging sentence production
- Haller et al. (2005)
- Inferior frontal gyrus was the site of most
activity during sentence generation - Confirms the critical role of this area in
syntactic encoding
37Neuroimaging mechanisms of language recovery
- Neuroimaging studies have revealed various
mechanisms of language recovery - Reactivation of functionally disrupted regions
- Up-regulation of other language networks
- Recruitment of homologue areas and/or surrounding
tissue
38Mapping therapy fMRI (Wierenga et al., 2006)
Patient 1 72 year old woman Left middle
cerebral artery CVA
Pre-post therapy change Increased recruitment of
Brocas area and adjacent inferior frontal cortex.
39Mapping therapy fMRI (Wierenga et al., 2006)
Patient 2 58 year old man Left middle cerebral
artery CVA
Pre-post therapy change Reduction of activity in
inferior frontal sulcus middle temporal gyrus.
40Neuroimaging Wierenga et al. (2006)
- Data suggest that the neural mechanisms
underlying changes to language function
post-surgery can differ between participants. - Further exploration of the neural mechanisms
underlying recovery is required - Which may lead to conceptually driven
rehabilitation strategies and improved treatment
efficacy
41What about sentence comprehension?
42What must a model of sentence comprehension be
able to account for?
(or an Absolutely Fabulous view of sentence
comprehension)
- The model must be able to account for the fact
that we can detect an acceptable versus an
unacceptable sentence, - e.g., Eddie and Patsy went to
- town.
- Eddie and Patsy put to town.
43- The model must be able to account for the fact
that we know implicitly about breaking up
sentences into their parts or pieces - E.g., Eddie and Patsy went to town
- Vs Eddie and Patsy went to town?
?
44and
- The model must account for the fact that we can
make judgements about reference - e.g., Patsy hit herself.
- Patsy hit her.
- And to recognise sameness of meaning
- e.g., Patsy hit Eddie.
- Eddie was hit by Patsy.
- And to recognise structural ambiguities
- e.g., Patsy drank the champagne
- in the car?
45and
- The model must be able to account for the fact
that we can understand spoken sentences at an
astonishingly rapid rate. - That most of these characteristics are innate or
automatic and are performed by us implicitly,
without conscious awareness. - And that we can understand quite complex spoken
sentences if we are required to. - The man that the child hugged laughed.
- The man kissed the girl who hugged the woman.
46Friederici, 2001 overview
Processes of reanalysis repair
Syntactic integration
Integration of semantic and morphosyntactic info.
Semantic relations
Identification of lemma and morphological info.
Thematic role assignment
Identification of word category
Syntactic structure building
Lexical-semantic access
Identification of word forms
Identification of phonemes
Phonological segmentation and sequencing
Primary acoustic analysis
47Lexical-semantic networks
lion
fur
tiger
animal
stripes
48Investigation of language processing using
semantic priming
- Refers to a reaction time advantage in
identifying a particular word when it is preceded
(or primed) by a related word. - Can be investigated subconsciously or when other
cognitive systems are active. - Assessed via computerized tasks.
49Semantic Priming
Prime
bird
350msec
Prime
?
night
Target
OWL
250 1000 msec
SOA
50A little aside
I need a volunteer from the audience.
51Multiple priming task results 250 SOA
521000 ms SOA
Delayed lexical access contributes to the
sentence comprehension difficulties associated
with nonfluent aphasia
53Summary
- Damage to inferior frontal cortex
- A disruption to the integration of semantic
syntactic information during sentence
comprehension and production - Delays in lexical-semantic activation
54Parkinsons Disease
55Language changes in PD
- Impaired naming and definitional abilities
- Reduced verbal fluency abilities
- Difficulties in interpreting ambiguity and
figurative language - Reduced performance when comprehending complex
sentences (e.g., object-relative sentences the
man that the woman hugged was happy)
56The controversy
- Are the language changes in PD an isolable
deficit or are they the result of associated
deficits in other systems (e.g., executive
resources, working memory, etc). - Is language represented and processed
subcortically?
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58What causes PD
- Most pronounced neuropathological feature is a
loss of dopamine neurons in the subcortex (the
substantia nigra), which leads to a reduction in
dopamine levels in the other subcortical regions,
e.g., the striatum.
59The role of the subcortex in human language
processing
60The action of dopamine
- Has two functions
- specific effects as a neurotransmitter (phasic DA
release) - as a non-specific neuromodulator (tonic DA
release)
61Finely balanced system. DA allows the system to
process salient information (the phasic
controlled) while acting to filter out less
salient information (the tonic controlled). DA
modulates the signal-to-noise ratio by both
facilitatory and inhibitory mechanisms
62In balance (S/N 1)
If remove filter (or make the gaps wider),
parallels situation where tonic DA is
reduced. Leads to increased noise, (S/N
and the DA system would fail to screen
irrelevant information (equivalent to
unfocussed activation).
If put finer filter, amount of information screene
d as irrelevant would increase, and lead to
focussed activation. Situation where tonic DA is
increased, lead to decreased noise, (S/N -
1).
63Investigation of indeterminacies of meaning using
semantic priming
- Refers to a reaction time advantage in
identifying a particular word when it is preceded
(or primed) by a related word. - Can be investigated subconsciously or when other
cognitive systems are active. - Assessed via computerized tasks
64Rationale
- Proposed that additional dopamine increases the
signal to noise ratio within semantic networks by
reducing spreading activation or dampening
weaker background signals. - Biased lexical ambiguities provide an ideal
avenue for investigating this hypothesis.
65Processing of semantic ambiguities
Bank
River
Money
Prime
Target
Target
Lexical
66Aims
- To investigate lexical ambiguity processing in
healthy participants both on and off levodopa,
and in participants with Parkinsons disease both
on an off levodopa.
67Stimulus set contained
- Two meanings frequencies
- dominant
- subordinate
- Two stimulus conditions
- related e.g, ball round (dominant)
- ball dance (subordinate)
- unrelated e.g., left round
- left dance
- and was presented at two stimulus-onset-asynchroni
es (SOAs) - 100 msec
- 1000 msec
68?
Prime
Target
calf
money
350msec
500msec
100 1000msec
SOA
69The influence of hyperdopaminergic states
- Students given Madopar? which contains 100 mg
levodopa and 25 mg benserazide or an identical
capsule of placebo. - Testing began 60 minutes after ingestion of the
capsule - Neither subject nor examiner was informed about
the capsules content.
70Results
PE Dom
PE Sub
PE Dom
PE Sub
100 msec
1000 msec
71Discussion
- Reduced subordinate meaning activation at the
short SOA in the levodopa group suggests that
dopamine acts to focus activation by dampening
weaker signals within the semantic network. - This process is magnified at the longer SOA with
both dominant and subordinate meaning activation
lost.
72The influence of hypodopaminergic states
PE Dom
PE Sub
PE Dom
PE Sub
100 msec
1000 msec
73Discussion
- Reduced dopamine enhances signal leading to
unfocussed activation of semantic information.
74The effect of increased hypodopaminergic states
PE Dom
PE Sub
PE Dom
PE Sub
100 msec
1000 msec
75Sentence processing in PD Electrophysiological
investigations
76Semantic ERP components
- N400 Reflects lexical-semantic processing
Correct The cat drank the milk
Incorrect The cat drank the ball
From www.sissa.it/cns/lcd/calacei/calacei/Site/CA
LACEI-2006_files/10.Friederici.CALACEI.May06.ppt
77Syntactic ERP components
- Early left anterior negativity (ELAN)
- Reflects early automatic phrase structure
building processes - P600
- Reflects late syntactic integration processes
Correct The shirt was ironed
Incorrect The shirt was on ironed
From www.sissa.it/cns/lcd/calacei/calacei/Site/CA
LACEI-2006_files/10.Friederici.CALACEI.May06.ppt
78Sentence processing ERPs in PD
- Friederici et al. (2003)
- N400
- ELAN
- P600
- Suggests basal ganglia contribute to late
syntactic integration processes - May explain sentence comprehension deficits in PD
?
79Lexical-semantic activation
- Evidence to suggest that significantly slowed
lexical-semantic activation may only be evident
in those PD patients with comprehension
difficulties (Angwin et al., 2005 Grossman et
al., 2002) - Slowed lexical-semantic access may contribute to
sentence processing difficulties in PD
- Dopamine dependent frontal-striatal system may
influence the speed of lexical-semantic
activation - Further evidence to support this theory
- Slower lexical-semantic activation when patients
tested off dopaminergic medication (Angwin et
al., 2005) - Poorer sentence comprehension when off medication
(Grossman et al., 2001)
80Summary
- Dopamine depletion in striatum and associated
disruption of frontal-striatal pathways - Reduced signal-to-noise ratio of information
processing ? subsequent difficulties suppressing
weak semantic information - Slowed lexical-semantic activation
- Disruption of syntactic integration processes
associated with sentence comprehension
81Schizophrenia
82Schizophrenia and thought disorder
- A subgroup of people with schizophrenia who also
have positive symptoms - Delusions
- Hallucinations
- Disorganised speech (e.g., frequent derailment or
incoherence) - Thus, disturbances of associational processes
considered to be a primary factor in
schizophrenia, i.e., they play a major role in
the formation of schizophrenic symptomatology - "In this malady the associations lose their
continuity. Of the thousands of associative
threads which guide our thinking, this disease
seems to interrupt, quite haphazardly, sometimes
such single threads, sometimes a whole group, and
sometimes even large segments of them. In this
way, thinking becomes illogical and often
bizarre....." (Bleuler, 1911, p. 14)
83The language of schizophrenia
- Samples of language from people with
schizophrenia who are thought disordered - "The next day when I'd be going out you know, I
took control, like uh, I put bleach on my hair in
California". - "Why do people believe in God?" elicits a
response like "Because make a twirl in life, my
box is broken help me blue elephant. Isn't
lettuce brave? I like electrons, hello."
Meet Ray
84Locus of language deficits
- Increased spreading activation in semantic memory
- Dysfunctional hemispheric laterality
- Executive deficits and dysfunction of contextual
processing
85Direct and indirect priming in schizophrenia
86Indirect priming
flag
sour
sugar
sweet
wine
87Study 1
- Aims to examine how people with schizophrenia
process semantic information across a defined
time period and the relationship between semantic
processing difficulties and Thought Disorder.
88Participants
- 14 PwS (mean age 33 years SD 9.62)
- 11 male and 3 female
- Mean education 12.23 years (SD 2.30)
- Mean length of illness 8.21 years (SD 5.74)
- Mean NART 96.17 (SD 10.29)
- Symptom summary scores also calculated
- Reality Distortion Score, Psychomotor Poverty
Score and Thought Disorder Summary Score - 12 matched healthy controls
89Stimuli
- Related Related target (RRT) soap plug BATH
- Related Unrelated target (RUT) soap gulf BATH
- Unrelated related target (URT) jail plug BATH
- Unrelated Unrelated target (UUT) jail gulf BATH
- Given at two SOAs (250 and 1000ms) and two RPs
(.75 and .33)
90The task
- A semantic priming task
- Participants made a lexical decision as to
whether the final word was a real word or a
nonsense word.
?
Prime
Prime
soap
Target
plug
BATH
500msec
250 1000msec
SOA
91Results
- PwS who are also thought disordered hyperprime on
related word pairs. - Positive relationship between TDSS and priming
effects for RRT
(Chenery et al., 2004)
92Schizophrenia and nicotine
- Schizophrenia and nicotine usage are inextricably
linked. - PwS are markedly prone to smoke tobacco
(prevalence rates estimated at 80-90 compared
with 20-30 in the general community), - schizophrenia is associated with higher daily
cigarette consumption, - the use of stronger cigarettes,
- the extraction of more nicotine from their
cigarettes, and - less success in quitting.
93A possible explanation for nicotine use in sz
- Nicotine serves as a form of self medication that
may - reduce the side effects of antipsychotic
medications, - enhance the therapeutic effect of antipsychotics
and so alleviate negative symptoms, and/or - ameliorate a number of cognitive deficits
associated with schizophrenia. - But investigations of PwS can be confounded by
many other variables.
94The schizophrenia spectrum
Schizotypy in the healthy population
Schizophrenia
Relatives of PwS
Schizotypy Personality Disorder
95Example of items used to rate schizotypy
- Unusual Experiences
- Are the sounds you hear in your daydreams
usually clear and distinct? - Have you occasionally felt as though your body
did not exist? - Introvertive Anhedonia
- Do you like mixing with people?
- Do you prefer watching television to going out
with other people? - Impulsive Nonconformity
- Do you at times have an urge to do something
harmful or shocking? - Have you ever felt the urge to injure yourself?
96Questionnaire items related to Cognitive
Disorganisation
- I sometimes jump quickly from one topic to
another when speaking. - I have trouble keeping on the topic.
- My speech seems confused to others.
- A word I was about to say often gets lost when I
go to speak. - I find it difficult to understand if someone
speaks in long sentences. - Do you ever feel that your speech is difficult to
understand because the words are all mixed up and
dont make any sense? - No matter how hard you try to concentrate, do
unrelated thoughts always creep into your mind?
97Aims.
- To investigate whether people with high
schizotypy ratings (loaded for odd speech items)
exhibit semantic processing abnormalities. - Predictions Low schizotypy will show priming for
strong associates but have reduced or absent
priming for weak associates. People with high
schizotypy ratings will show priming for the
weakly associated word pairs, providing support
for the hyperactivation hypothesis. - Nicotine will normalize the high schizotypy
priming patterns.
98Stimuli
- 24 strongly related word pairs (e.g., chef food)
- 24 weakly related word pairs (e.g., couch relax)
- 16 unrelated word pairs (e.g., appear golden)
- 16 word nonword pairs (e.g., bible garshar)
99The N400
The horse galloped in the custard.
100The EEG Priming Trial Sequence
Prime
Target
sky
?
money
500msec
SOA 1000msec
1000msec
1500msec
101(No Transcript)
102High schizotypy with nicotine
103Low schizotypy with nicotine
Unrel Strong Weak
104Discussion
- Low schizotypy group
- Our data show a priming effect only for the
strongly related prime target pairs. - High schizotypy group
- Priming for both strongly and weakly associated
words but a nicotine patch normalizes the
priming.
105Implications for future management
- If nicotine "normalises" performance, this result
will have marked consequences for anti-smoking
and quit campaigns in schizophrenia - Improved knowledge of the role of
neurotransmitters such as dopamine in cognitive
performance might eventually lead to safe and
effective nicotine agonist therapy thus giving
people with schizophrenia the cognitive enhancing
effects of nicotine without the significant
carcinogenic risk.
106Dopaminergic modulation of information processing
- Dopamine exerts a neuromodulatory influence on
prefrontal cortex via meso-cortical pathways - Prefrontal cortex involved in maintaining
updating contextual information crucial for
cognitive function and language processing
From http//mywebpages.comcast.net/epollak/PSY255_
pix/DA_paths.JPG
107Cohen et al. (1999) Braver et al. (1999)
- Dopaminergic modulation of prefrontal cortex
- Phasic dopamine updating of context
- Tonic dopamine maintenance of context
- Computational modeling increased noise in
mesocortical dopamine system leads to - Increased tonic activity ? deficits in context
maintenance - Decreased phasic activity ? deficits in updating
of context
108Dementia
109 Alzheimers Disease - neuropathology
-
- hallmark changes associated with the disease are
- neurofibrillary tangles
- senile plaques
- cerebral atrophy
- ventricular dilation
110(No Transcript)
111Senile plaques - an extracellular abnormality
112The cerebral atrophy is clearly shown at autopsy
113A cross-sectional view
114Dementia of the Alzheimers type
- He thinks that he is the only impatient man in
this House to get things done. I will beat him
50 any day he likes. No doubt he has a hawk-like
desire for action, without bridle and without
saddle, across the Atlantic.
from Mahendra, 1987
115Diary entries
116Diary entries
To speak now is a great effort, and in the
ground to be covered and the development of the
argument, I get more and more confused.
from Mahendra, 1987
117(No Transcript)
118Remember these words
119Individual task Write down the words just
presented.
120Semantic impairment
- What is the nature of the semantic impairment in
DAT? - Is the deficit one of impaired access to semantic
knowledge or actual loss of information? - What implications does this have for implicit
versus explicit memory? -
121Loss of semantic knowledge
ANIMAL
DOG
Direction of semantic degradation
TAIL
PAWS
FUR
122Semantic priming in dementia (Giffard et al.,
2001)
Word pair presented during priming
LION
TIGER
Wild Animal
Wild Animal
?
?
STRIPES
MANE
123We know that
- Semantic strategies can assist in memory
processing - Implicit memory is better preserved than explicit
memory - Word meanings follow a known pattern of erosion
in dementia. - Can we use this knowledge to help PwD make the
transition from home to a RCF less traumatic both
for them and their caregivers?
124Implications for future management
- Begin the process of transition to a RCF while
still at home using structured semantic therapy
to assist the laying down of implicit memories of
the new environment.
125Conversations
http//www.abc.net.au/4corners/stories/s495625.htm
126Group Task Whats wrong with the conversation?
127Conversational Analysis
- Why is it valuable to the assessment of
disordered interaction? - Because it uses everyday conversations as data
- because it focuses on conversation as a
collaborative achievement - because it emphasises the social role of language
- because it is a client-driven approach
- because it is a minimally obtrusive tool
128Features of natural conversations
- In conversation, many unspoken rules exist that
create order - The aim of CA is to ascertain and describe the
nature and characteristics of the rules/features
that exist. - We can let our conversational partner know if a
mis-understanding has taken place - We use trouble-indicating behaviours to highlight
a point of trouble in understanding the message
129Features of natural conversations
- Now the trouble source can be altered or
clarified - We use repair types to remediate the trouble
source
130Definitions of terms
- Trouble indicating behaviours - behaviours that a
listener can use to highlight a point of trouble
in understanding the message the speaker is
intending (e.g., the listener can request a
repetition or can take a best guess at what was
meant by the speaker) - Repair types - a strategy that aims to alter or
clarify the trouble source (e.g., paraphasing)
131Conversational Analysis in DAT
Individual Task Circle the trouble in this
conversation
132WC17 Do you have any kids? DAT18 Huh? WC19 Do
you have any children? DAT20 Children, well my
my fam-family were a heavy family. three three
or four. WC21 Oh, you mean a large family.
DAT22 Yeah, well we might have one of
three. WC23 Have you got one or three
children? DAT24 Um, I I didnt have any one or
three for myself They were my ah mother,
father, sister /w/ when I went to school. WC25
Did you have your own children? DAT26 Ah no I
used to go to school right (unint) about that
size. WC27 What would be that size? DAT28
Cant go to school in the morning cause all
depends on where you are. WC29 Did you grow up
in the country or in the city?
133Data analysis
- Trouble Indicating Behaviours (TIBs)
- 12 categories in total which included
- 1. Requests for repetition
- 2. Requests for specific information
- 3. Corrections
- 4. Lack of uptake/lack of continuation
- 5. Hypothesis formation
- 6. Metalinguistic comment
- 7. Reprise/minimal dysfluency
134Frequency of TIBs
Proportion
135Data analysis
- Repair types
- 7 in total including
- 1. Repetition
- 2. Revision/reformulation
- 3. Addition/specification
- 4. Inappropriate/withdrawal
136Frequency and effectiveness of repair types.
137Summary of Results
- Hypothesis formation and Request for specific
information were used most often by normal
speakers to indicate trouble. - Both these TIBs were highly interactive, meaning
that the well partner was better placed to take a
greater burden when signalling and repairing
trouble.
138Summary of Results
- The people with DAT used non-interactive ways of
signalling trouble. - During these breakdowns, the normal partner most
often repaired the trouble, although some
misunderstandings were left unresolved.
139Treatment options
- Naming therapy
- Can improve naming but only for treated items
- Principles of spaced-retrieval and errorless
learning may facilitate learning of new
information - Caregiver training in suitable communication
strategies is crucial - Family/home-based caregivers
- Staff in residential care facilities