abnormal behavior - eötvös loránd...
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Abnormal behavior(animal welfare)
MSc Ethology
Pongrácz Péter
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A phenomenon whish is
surprisingly difficult to define
• A behavior is abnormal, if
– Represents a minority in the population
– Lowers the fitnes of the actor, or/and
– Causes physical/mental/social harm to the
actor, or/and
– Caused by an illness/injury/malformation
Rather convincing criteria
Or not?
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Defining abnormal behavior in humans?
Not a good task for a biologist
• Done by a minority?
– Be unique! Or… Follow the trend!
• Lowers the fitnes?
– Traditional altruists
• Causes harm?
– Adrenalin junkies
• Caused by physical/mental conditions?
– Do not discriminate!
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In case of humans…
• What is ‚normal’?
– Social/ cultural factors may modify
– Against the ‚rules’ is not necessarily abnormal
– Abnormal behavior must be defined on the
basis of biology
– ‚Abnormal’ implies ‚undesirable’ needs to
be changed
– Caution is needed therefore before labeling
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Different explanations
(mostly human) abnormal behavior
Biological
explanations
Abnormalities must
have a biological
reason
Infection, brain
damage,
biochemistry,
genetics
Behaviorist
explanations
All (bad)
behaviors are
learned
(born with
tabula rasa)
Conditioning
(classical,
operant)
Social learning
Psychodynamic explanations
Abnormal behaviors have
psychological and not physical
causes
3 main sources: inner conflict,
childhood experiences,
uncosncious motivations
Cognitive explanations
Abnormal behavior is a
consequence of an erroneous
thinking about events and their
outcome
Irrational thinking, errors of logic
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Abnormal behavior in animals
• A behavior is abnormal, if
– Represents a minority in the population
We should be careful when discussing
different strategies
Sub-optimal is not necessarily abnormal
On the other hand… what if a whole
population shows abnormal behaviors?
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Abnormal behavior in animals
• A behavior is abnormal, if
– Lowers the fitnes of the actor
• Careful examination is needed
– Cases of inclusive fitnes/ kin selection
– Reciprocal altruism
– Siblicide
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Abnormal behavior in animals
• A behavior is abnormal, if
– Causes physical/mental/social harm to the
actor
• Caution is needed in case of
– ‚Self sacrifice’
– Costly signals
– Dangerous behaviors
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Why do we need animal welfare
research?
• Animal welfare
– Complex term
– Ethics, politics, regulation
– Scientific research (ethology, physiology, anatomy etc.)
• Abnormal behaviors
– Ethology, veterinary science
• Stress
– Ethology, physiology, pharmacology, fundamental research
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Stress
• Originally a term in physiology (Cannon, Selye) – response to potentially dangerous stimuli
• Dual response– Sympathetic nervous system + adrenalin
cardiovascular and digestive system
– ACTH (hypophysis) – corticosteroids(‚stress-hormones’) metabolism
• Chronic stress harmful
• Stress can be interpreted in a non-physiological framework, too
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Stress can be regulated through
behavior
• Weiss (1971) experiments on rats with
electric (painful) stimuli
• Intensity of stress depends not only on the
strength of the stressor
– Predictable shock – weaker stress
– Controllable shock – lower response
– Control must be adequate to the type of
stress stimulus
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Stress and personality
• Stress reaction depends on the individual
• Two main types:
– (A): sympathetic reaction is dominant
– (B): weaker sympathetic response
• In human psychology:
– Extroverted (active problem solving, tendency for aggression)
– Introverted (more peaceful, supressed reaction)
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Animal personality and stress
• Tupaia males: dominant, active submissive, passive submissive– Low survival rate for passive submissives
• Restraint test for piglets– Fighters (lower meat quality later)
– ‚Peaceful’ ones (gives better quality meat even among more stressed conditions)
• Stress-related mouse types– Resident male: instant attack vs. no attack
– Confident in maze vs. freezes at every novelty
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Here is a tupaia
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Proactive vs. Reactive personalities
• Proactive– In case of problem it
uses old routines (rigidity)
– Aggressive
– Sympathetic system dominates
– Chronic stress cardiovasular illnesses
• Reactive– In case of problem
flexible reaction, quick adaptation
– Peaceful
– Weaker sympathetic response
– Chronic stress compromised immune system, infections
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Abnormal behavior in
domesticated animals
• But what is normal?
– Behaviors (acquired and inherited) that proved to be
adaptive along the evolution from the aspects of fitnes
and survival
• How can we tell, what is normal in a
domesticated animal?
– The behavior of its wild ancestor (?)
– The behavior of feralized population (?)
– The behavior expressed in natural habitat (?)
Some species are ‚artificial’
For example: dogs
Natural habitat = human habitat
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Typical abnormal behaviors
• Common type = Normal?
– If most of the individuals are kept among
unnatural conditions most common
behaviors may be abnormal
• Stereotypic behaviors
• Abnormal aggression
• Cannibalism
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Stereotypic behavior
• Seriously repetitive, constant, without obvious goal or benefit
• E.g. cribbing horses, tonguerolling cow, gridchewing pig, pacing chickens, foxes...
• Caused by weakly stimulating environment
• And/or unsatisfied, however highly motivated behavioral needs– Feeding, nesting, hunting, territoriality
• Do stereotypic behaviors harm welfare?– Severe stereotypies cannot be amended by enriched
environment
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Cribbing was not possible to break with
Ad libitum food (hay and salt)
Stereotypic behaviors release dopamine (pleasure)
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Abnormal aggression
Aggressive behavior is often normal.
Most domesticated species is lesss aggressive than its ancestor.
Abnormal aggression is caused by:
- crowded keeping
- constantly changing groups (horses, cattle, pigs)
- weaker (loser) individuals cannot leave
- some breeds, types were selected for high aggression
Many people are highly sensitive to aggressive behavior
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Cannibalism• Occurs among natural circumstances!
– Lack of food (infanticide, siblicide)
– Competition (others’ offspring)
• Domesticated animals– Usually is is NOT out of control aggression!!!
– Crowdedness + stress + non-stimulating environment (pig tail biting)
– Crowd + stress + aggression + conditioning (feather plucking and cloacal cannibalism in hens)
– Improved environment may help (?)
– Functional remedies (tail cropping, debeaking)…
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Abnormal behavior – approach from
Tinbergen’s 4 aspects
• E.g. feather plucking in mass-produced
chicken
– Mechanism (what happens?)
– Ontogeny (how does it develop?)
– Function (why is it ‚adaptive’?)
– Evolution (is it present in other (related)
species?)
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Abnormal behavior – approach from
Tinbergen’s 4 aspects
• E.g. feather plucking in mass-produced
chicken
– Mechanism (what happens?)
– Ontogeny (how does it develop?)
– Function (why is it ‚adaptive’?)
– Evolution (is it present in other (related)
species?)
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Abnormal behavior – approach from
Tinbergen’s 4 aspects
• E.g. feather plucking in mass-produced
chicken
– Mechanism (what happens?)
– Ontogeny (how does it develop?)
– Function (why is it ‚adaptive’?)
– Evolution (is it present in other (related)
species?)
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