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Journal of Neuroscience, Vol 5, 1103-1110, Copyright © 1985 by Society for Neuroscience
Attentional influences on noxious and innocuous cutaneous heat detection in humans and monkeys
MC Bushnell, GH Duncan, R Dubner, RL Jones and W Maixner
This study examines whether selective attention can influence sensory-
discriminative aspects of nociception in humans and monkeys trained to
detect innocuous and noxious thermal stimuli. Human subjects had two
contact thermodes positioned bilaterally above the upper lip. Upon trial
initiation both thermodes heated to either 39 degrees C, an innocuous warm
temperature, or 45 degrees C, a slightly noxious temperature. After 4 to 9
sec, the temperature of one thermode increased an additional step of less
than 1 degree C. Subjects released a button when they detected this second
temperature increase (T2). Three types of trials were presented in order to
assess the effects of spatially selective attention on thermal detection.
On 40% of the trials a light correctly signaled the location of the
thermode on which T2 would occur. On 10% of trials a light incorrectly
signaled the location of T2. No signal was presented on the remaining
trials. From the 45 degrees C base line, detection latencies were shortest
in the correct signal condition, longest in the incorrect signal condition,
and intermediate in the unsignaled condition. The percent of undetected T2s
was greatest in the incorrect signal condition and least in the correct
signal condition. From the 39 degree C base line, the detection latency in
the incorrect signal condition was greater than in the unsignaled
condition, but the latter latency was not different from the correct signal
latency. In addition, the percent of undetected T2s was the same on all
three types of trials.(ABSTRACT TRUNCATED AT 250 WORDS)
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