Formal learning theory dissociates brain regions with different temporal integration.
Learning can be characterized as the extraction of reliable predictions about stimulus occurrences from past experience. In two experiments, we investigated the interval of temporal integration of previous learning trials in different brain regions using implicit and explicit Pavlovian fear conditioning with a dynamically changing reinforcement regime in an experimental setting. With formal learning theory (the Rescorla-Wagner model), temporal integration is characterized by the learning rate. Using fMRI and this theoretical framework, we are able to distinguish between learning-related brain regions that show long temporal integration (e.g., amygdala) and higher perceptual regions that integrate only over a short period of time (e.g., fusiform face area, parahippocampal place area). This approach allows for the investigation of learning-related changes in brain activation, as it can dissociate brain areas that differ with respect to their integration of past learning experiences by either computing long-term outcome predictions or instantaneous reinforcement expectancies.
Gläscher
Jan
J
Neuroimage Nord, Department of Systems Neuroscience, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, D-20246 Hamburg, Germany. glaescher@uke.uni-hamburg.de
Büchel
Christian
C
D000328:Adult; D001921:Brain / Q000033:anatomy & histology* / Q000098:blood supply / Q000502:physiology*; D001931:Brain Mapping; D003214:Conditioning, Classical; D005239:Fear; D007839:Functional Laterality; D005712:Galvanic Skin Response / Q000502:physiology; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D007858:Learning / Q000502:physiology*; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D008570:Memory, Short-Term / Q000502:physiology; D008959:Models, Neurological; D017711:Nonlinear Dynamics; D010100:Oxygen / Q000097:blood; D010775:Photic Stimulation; D011237:Predictive Value of Tests; D011597:Psychomotor Performance / Q000502:physiology*; D012044:Regression Analysis; D012054:Reinforcement, Psychology
D010100:Oxygen