Pharmacological modulation of perceptual learning and associated cortical reorganization.
The pharmacological basis of perceptual learning and associated cortical reorganizations remains elusive. We induced perceptual learning by Hebbian coactivation of the skin of the tip of the right index finger in humans. Under placebo, tactile two-point discrimination was improved on the coactivated but not on the left index finger. This augmentation was blocked by an N-methyl-D-aspartate-receptor blocker, but doubled by amphetamine. No drug effects were found on the left index finger. The individual amount of cortical reorganization as assessed by mapping of somatosensory evoked potentials was linearly correlated with the pharmacological modulation of discrimination thresholds, implying that perceptual learning and associated cortical changes are controlled by basic mechanisms known to mediate and modulate synaptic plasticity.
Dinse
Hubert R
HR
Institute for Neuroinformatics, Department of Theoretical Biology, Ruhr-University Bochum, D-44780 Bochum, Germany. hubert.dinse@neuroinformatik.ruhr-uni-bochum.de
Ragert
Patrick
P
Pleger
Burkhard
B
Schwenkreis
Peter
P
Tegenthoff
Martin
M
D000328:Adult; D000661:Amphetamine / Q000494:pharmacology*; D001931:Brain Mapping; D004193:Discrimination Learning / Q000187:drug effects*; D004558:Electric Stimulation; D005073:Evoked Potentials, Somatosensory / Q000187:drug effects*; D018691:Excitatory Amino Acid Antagonists / Q000494:pharmacology; D005260:Female; D006801:Humans; D017774:Long-Term Potentiation / Q000187:drug effects; D008297:Male; D008559:Memantine / Q000494:pharmacology*; D008875:Middle Aged; D009473:Neuronal Plasticity / Q000187:drug effects; D010465:Perception / Q000187:drug effects*; D016194:Receptors, N-Methyl-D-Aspartate / Q000037:antagonists & inhibitors / Q000502:physiology; D013003:Somatosensory Cortex / Q000187:drug effects / Q000502:physiology*; D014110:Touch / Q000187:drug effects
D018691:Excitatory Amino Acid Antagonists; D016194:Receptors, N-Methyl-D-Aspartate; D000661:Amphetamine; D008559:Memantine