The Psychology of Pain Flashcards
What is pain?
-A perception
-Aversive
-Unpleasant
-Many components:
*Sensory =
*Affective =
*Cognitive =
*Motivational =
-Sign of potential tissue damage
-Purpose = demonstrates your body is not coping w/ demands of its ext &/or int env - so is a survival mechanism
Why do we have pain?
-Gives constant feedback about body - so can make adjustments to how we sit/sleep
-Warns - sign something wrong = causes protective beh (survival mech!)
-Triggers help-seeking beh
-Psych consequences - can = fear & anxiety
How do psychologists view pain?
As learned or conditioned beh
How do neuroscientists view pain?
As a sensory phenomenon based on perception
How do doctors view pain?
As warning sign something is wrong & needs diagnosing & treating
Why is knowing about pain SO important?
-Mostly people see Drs about pain
-Aspect of many conditions
-Scale of pain to understand - different stages/types
Give the 3 stages of pain.
-Acute
-Pre-chronic
-Chronic
What is acute pain?
-Adaptive
-Often linked to objective/identifiable injury/disease
-Self-limited
-Resolves in hrs->days –> i.e, is a time frame of how long will last - until healed
*Time sensitive - start & end
-Linked to objective autonomic features
-High symp activity
e.g., burns
What is pre-chronic pain?
= critical time when person starts healing - overcoming pain/lose hope & feel helpless
-A midpoint
-Escalate or moderate
What is chronic pain?
-Normal healing time has ended - pain continues (6 months - years)
-Don’t know how long pain will continue for - unknown resolution
*Not time-sensitive
-Interferes w/ daily activities
-Often experienced in absence of detectable tissue damage
-Vague descriptions of pain & inability to describe pain’s timing & localisation
-Lacks signs of heightened symp activity
-Depression & anxiety = common
e.g., arthritis
What is the pain pathway?
Many parallel neuronal pathways carrying different aspects/types of pain –> which ascend to brain within various tracts of spinal cord
What are the 4 components of the pain pathway?
-Transduction
-Transmission
-Modulation
-Perception
Summarise in simple stages which order the 4 components of the pain pathway go in.***
1- Periphery (PNS) = transduction -> transmission
2- Spinal cord (CNS) = modulation
3- Brainstem (CNS) = descending modulation
4- Cortex & sub-cortical regions = perception, sensory & affective pain components
What is transduction?
Afferent nerve endings translate noxious stimuli (pain causing) into impulses carrying pain messages
What are the 3 primary afferents & what types of sensations do they carry - transduction?
- A-beta - carry info related to touch
- A-delta - carry info related to pain & temp
- C-fibres - carry info related to pain, temp & itch
What are the receptors that sense: heat, mech & chem tissue damage & where are they found - transduction?
Nociceptors
–> in skin & organs
What is the name of the process of perceiving pain?
Nociception
What is transmission?
Impulses sent to dorsal horn of spinal cord -> then along sensory tracts to brain
What are the 2 types of fibre systems pain impulses are transmitted by - transmission?
1 = fast, sharp, well localised sensation (1st pain) - conducted by A-delta fibres (in transduction) = i.e., ACUTE PAIN
2. duller, slower onset, often poorly localised sensation (2nd pain) - conducted by C-fibres (in transduction) = i.e., CHRONIC PAIN
What is modulation?
Dampen (lowers) or amplify (inc.) pain-related neural signals
(modulates = makes pain better or worse)
What is the descending inhibitory input of modulation?
Dampen (lower) of fully block incoming ascending nociceptive signals @ gate of dorsal horns (in spinal cord)
-Desc pathway attempts to block asc pathway
Importance of being able to block asc pathway of pain experience
So not continually in pain - or CNS isn’t always aware of pain
Expand on what the gate control theory is.
-Neural gate in spinal cord - regulates pain experience - perception of pain
-Pain is NOT result of straight-through sensory channel - can be blocked
-Has physiological & psychological causes
What are some psychological causes that can influence the gate of the dorsal horns of spinal cord?
-Behavioural state - attention (focus on pain source)
-Emotional state - anxiety, fear, depression
-Prev experience of that type of pain - never experienced before
–> all will open gate - amplifies pain experience/perception
(but if had experienced pain before - may close gate - dampens pain perception)
Outline what way the ascending & descending pain pathways go.
-Asc = nociceptors (skin/organs) -> periphery -> spinal cord -> brainstem -> cortex & subcortical regions ->
-Desc = cortex & subcortical regions -> brainstem -> spinal cord (desc modulation stimulated opioid-releasing cell = inhibits spinal pain signal)