Baseline

Experimental Mechanical Nociceptive Pressure Stimulus

Short Term Pain Memory

Long Term Pain Memory or

Visualization

Quiet supine resting

(both groups)

Maximum tolerable

mechanical pressure pain

(both groups)

Memory of maximum tolerable pressure pain

(both groups)

Memory of previous substantial injury or

visualization of lower extremity

Clustered. Mechanical nociceptive pressure pain

always preceded short term pain memory

Randomized order

Randomized order

Randomized order