clinical animal behaviour models of stereotypic behaviour...
TRANSCRIPT
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D A N I E L S . M I L L S
S C H O O L O F L I F E S C I E N C E S
U N I V E R S I T Y O F L I N C O L N R I S E H O L M E P A R K
L I N C O L N L N 2 2 L G
Clinical Animal Behaviour Models of Stereotypic Behaviour and Underlying
Cognition
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Overview 2
What is stereotypic behaviour?
Phenotypic variability
Stereotypy and Obsessive Compulsive behaviour
Heterogeneity of gross phenotypes
Mechanistic and Causal
From laboratory to the field
Ex laboratio animal models of natural occurring human mental illness
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Some differentials for tail chasing
Middle ear inflammation Pain – musculoskeletal or neurological
Tail Back Hind quarters
Irritation in the tail region Skin Anal sacs
Seizure Primary neurological Metabolic
Play Attention seeking behaviour Acute motivational conflict “Compulsive-type” disorder Stereotypy
Stereotypic behaviour
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Stereotypic behaviour 4
Repetitive, relatively invariate behaviour in which the function is not obvious from the form or context of the behaviour
Stereotypic behaviour is a gross phenotype requiring elaboration
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Stereotypy versus Obsessive compulsive disorder
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Stereotypy
“activities involving specific movements
(eg, rocking and hand flapping or waving)
or more broadly … heterogeneous self-directed, repetitive behaviors, activities, and interests
(eg, covering ears, staring at an object, pacing, object fixation, playing in a fixed pattern, picking skin)
Singer 2009
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Stereotypy versus Obsessive compulsive disorder
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Obsessive compulsive behaviour Obsessions as defined by (1), (2), (3), and (4):
1. Recurrent and persistent thoughts, impulses, or images that are experienced, at some time during the disturbance, as intrusive and inappropriate and that cause marked anxiety or distress
2. The thoughts, impulses, or images are not simply excessive worries about real-life problems
3. The person attempts to ignore or suppress such thoughts, impulses, or images, or to neutralize them with some other thought or action
4. The person recognizes that the obsessional thoughts, impulses, or images are a product of his or her own mind (not imposed from without as in thought insertion)
Compulsions as defined by (1) and (2):
1. Repetitive behaviors (e.g., hand washing, ordering, checking) or mental acts (e.g., praying, counting, repeating words silently) that the person feels driven to perform in response to an obsession, or according to rules that must be applied rigidly
2. The behaviors or mental acts are aimed at preventing or reducing distress or preventing some dreaded event or situation; however, these behaviors or mental acts either are not connected in a realistic way with what they are designed to neutralize or prevent or are clearly excessive
DSMIV
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Mechanistic heterogeneity: A simple neurobiochemical reduction
Obsessive- Compulsive Behaviours Failure to use knowledge to inhibit behaviour
Anxiety related disorders
Tics
Tourette’s Syndrome
Stereotypy Failure to inhibit the release of organised behavioural patterns
Schizophrenia
Autism
Tardive stereotypies
tardive dyskinesia/ t. chorea / dystonia / akathesia
Serotonin
Dopamine
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Causal heterogeneity: A simple ontogenic reduction
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Frustration displacement Seeking pleasure
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Two processes in classification
Identification & labelling of collections of related characteristics
Appropriate assignment of individuals
Diagnostic process
Diagnoses are rarely objectively verified in practice
Diagnoses are hypothetical constructs
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A
B
C D W
X
Y
Z
The traditional view of
psychopathology
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A B C
A spectral approach
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Consequences
In these circumstances, the behaviour problem is an emergent trait from the normal behaviour strategies of the individual. It is not a pathology
If a normal system is overtaxed or exhausted then a genuine pathology may arise, this is often characterised by a disintegration of functional value
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The nature of behaviour problems
Most are combinations of behavioural responses and emotional states which have their origins in normality and are spectral in their form
Thus mechanistic investigations may only identify normal mechanisms rather than the factors which make the behaviour inappropriate
Need to frame behaviour problems in the context of key: Behavioural
Affective
Cognitive
processes
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An evolutionary / biological approach
If behaviour appears inappropriate then investigate nature, source and degree of any suboptimality
Distinguish those processes which are directly related to a definable organic lesion.
Recognise the functional value at an evolutionary level of any psychological expressions even if they are not effective in a proximate sense
Triangulation of evidence to make rational inferences
Identification of biological markers
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Repetitive behaviour in companion animals and human mental health disorders
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?potential for increased validity
Over-reduction of laboratory models
Pharmacological models
Genetic models
Companion animal models arise in similar contexts to humans through shared environment
Reflect true complexity of the phenotype
Wide range of conditions and differentials to consider
Analogies with human conditions often made on the basis of very superficial characteristics
Need to develop better clinical diagnostic process
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Teasing out the neurological basis to stereotypic behaviour
Biobehavioural markers
• Higher dopamine activity is correlated with higher rates
of spontaneous eye blinks
• Increased dopamine activity in basal ganglia of
schizophrenics • opposite in Parkinson’s
• Eye blink frequency
• Stereotypic schizophrenics – higher
• Parkinson’s - lower
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17 Behavioural Correlates of Stereotypy
Basic behavioural correlates of neurological function
DA, eye blink & Sty
Change in DA function
Change in motor organisation
Stereotypy
Change in spontaneous responsiveness
Spontaneous blinking
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Assessment of blink rate in stereotypic horses
Methodology 6 weavers
8 windsuckers and crib biters
Paired height matched control no Sy
No visual or ocular disease apparent
Four x one-minute videos
Light level assessed
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Results:
Results of Blink Rate Data Comparing Weavers and
Controls.
0
10
20
30
40
50
1 2 3 4 5 6
Matched Pair Number
Avera
ge E
ye b
lin
k
Rate Weavers
Controls
P= 0.33
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Results:
Results of Blink Rate Data Comparing Crib-
Bitters/Windsuckers and Controls.
0
10
20
30
40
50
1 2 3 4 5 6 7 8
Matched Pair Number
Avera
ge E
ye B
lin
k R
ate
Crib-biters and
Windsuckers
Controls
P=0.02
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Variability in behaviour
No significant difference between control populations.
S.E.M S.D
Weavers 2.34 5.74
Weaving Controls 2.08 5.1
Cribbers 3.71 10.5
Cribbing Controls 1.93 5.46
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Conclusions 22
Need to develop a biological framework to describe the differentials of stereotypic behaviour (and other problem behaviours) based on a recognition that
Maladaptive behaviour is not necessarily malfunctional
consideration of cognitive and affective aspects of behaviour
Specific behaviours serve higher motivational-emotional systems
Behaviours are unlikely to be pathognomic for a given condition
Use an evidence based approach to improve the assignment of individuals to these categories