Pain-evoked anterior cingulate activity generating the negative difference potential may reflect response selection...

Area of Science:

• Neuroscience
• Pain Research
• Cognitive Neuroscience

Background:

• The negative difference potential (NDP) is linked to cognitive anterior cingulate cortex (ACCcd) activity.
• Understanding how the brain processes pain involves examining neural responses to various stimuli.

Purpose of the Study:

• To investigate the impact of a heterotopic cold pain stimulus on NDP and subjective pain ratings.
• To explore the role of ACCcd activity in pain perception and cognitive processing.

Main Methods:

• 24 participants received electrical stimulation of the sural nerve.
• A heterotopic cold pain stimulus was applied to the hand.
• Scalp-recorded NDP and subjective pain ratings were analyzed.
• Dipole source localization estimated ACCcd activity.

Main Results:

• Cold pain stimulus reduced subjective pain ratings.
• ACCcd activity at 125 ms remained unchanged.
• ACCcd activity at 210 ms was significantly larger under cold pain conditions.

Conclusions:

• Pain perception involves dissociation between ACCcd activity and subjective ratings.
• Pain-evoked ACCcd activity at 210 ms may reflect cognitive processes like response selection.
• Not all nociceptive neurons in ACCcd are involved in basic pain sensation.