Predictive coding
How expectation and attention interact to process pain in the brain
Open access · cc by · source: Europe PMC
Expectation violations and focused attention both amplify pain processing by boosting the excitability of sensory-processing neurons in the somatosensory cortex.
How this study connects
Role on claims
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Unexpected sensory events trigger widespread feedforward signals from primary sensory areas to higher-order cortical regions like the prefrontal, frontal, or parietal cortices.
Evidence for the claim as stated.
Violations of expectation and spatial attention can directly modulate the gain of sensory-processing neurons by reducing local self-inhibition in sensory cortices.
Evidence for the claim as stated.
The processing of unexpected tactile stimuli or pain involves a dynamic shift in effective connectivity, prompting increased feedforward signaling from primary sensory areas to frontal and parietal networks.
Evidence for the claim as stated.
Study at a glance
- Design
- Human experiment — fMRI painful oddball with laterality and attention manipulations; 1000 stimuli including 200 deviants
- N
- N=22 · 26 recruited; 22 analyzed (12 women; mean age 23, range 20–29)
- Population
- Healthy right-handed Aarhus volunteers without pain, neurological, or psychiatric history
- Outcome
- Neural responses to unexpected painful stimuli jointly modulated by expectation violation and attention
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How expectation and attention interact to process pain in the brain
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22 participants
The final sample included 22 participants (12 females; mean age=23 years; range=20–29 years).
3 painful stimulus repetitions
After a minimum of 3 and a maximum of 7 painful stimulus repetitions on the same hand, the location of the stimulation switched to the dorsum of the other hand repeatedly, throughout the duration of each block (B).
Key findings
Both focused attention and unexpected pain switches increased the neural gain—specifically, by decreasing self-inhibition—of superficial pyramidal cells in the primary and secondary somatosensory cortices. However, while attention had a symmetrical effect, unexpected pain primarily boosted neural gain contralaterally. Additionally, unexpected pain increased feedforward and feedback communication between somatosensory, frontal, and parietal regions.
Methodology
Researchers recorded brain activity using magnetoencephalography in 22 participants while delivering painful electrical pulses to their hands. To test how expectation affected pain, they used a sequence where the pain switched hands unexpectedly after 3 to 7 repetitions of the same location. To test attention, they had participants either focus on the pain to count location switches or focus on a visual cross, while receiving 1000 painful stimuli.
Limitations
A major limitation of the study is the lack of a behavioral measure of expectation violation, meaning the researchers could not directly assess how surprise itself altered subjective pain ratings. Additionally, the experimental design only tested spatial expectation violations, leaving it unclear if these neural mechanisms generalize to temporal expectations or changes in pain intensity. The findings are also limited to a relatively small sample of healthy young volunteers.
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