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Author Coburn, Kerry L. ♦ Ashford, J. Wesson ♦ Fuster, Joaquin M.
Source CiteSeerX
Content type Text
File Format PDF
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Temporal Lobe Structure ♦ Stimulus Information Load ♦ Visual Response Latency ♦ Vep Latency ♦ Flash Data ♦ Cortical Mechanism ♦ Significant Aspect ♦ Evident Role ♦ Considerable Interest ♦ Coincident Arrival ♦ Retention Interval ♦ Net Inhibition ♦ Flash Information ♦ Unit Latency ♦ Visual Environment ♦ Discriminative Behavioral Response ♦ Excitatory Response ♦ Superior Temporal Sulcus ♦ Color Sample ♦ Temporal Synchronization ♦ Visual Stimulus ♦ Relevant Dimension ♦ Sts Cortex ♦ Color Sample Vep Latency ♦ Matching-to-sample Task ♦ Visual Perception ♦ Inferotemporal Cortex ♦ Area Tea ♦ Flash Veps ♦ Baylis Roll ♦ Interstimulus Interval ♦ Imminent Presentation ♦ Itc Respond ♦ Unit Data ♦ Single Neuron ♦ Inferior Bank ♦ Color Sample Information
Abstract In a monkey performing a visual delayed matching-to-sample task, units and visual evoked potentials (VEPs) were sampled from the inferior bank of the superior temporal sulcus (STS; Areas TEa and IPa), the hippocampus, and the presubiculum. VEP latencies indicated that flash information—signaling the imminent presentation of a color sample to be retained— reached the presubiculum and the hippocampus substantially earlier than the STS. In contrast, color sample VEP latencies did not differ between sites, arriving at all sites appreciably later than flash VEPs. Unit data indicated generally excitatory responses to both stimuli at all sites and net inhibition during the interstimulus interval separating flash from sample. As with VEPs, unit latencies to flash were shorter than to sample stimuli. The alerting flash data imply activation of the hippocampus occurring before activation of the STS cortex, whereas the coincident arrival of color sample information suggests temporal synchronization between these structures. In attempting to understand the cortical mechanisms underlying visual perception and memory, considerable interest has focused on the inferotemporal cortex (ITC) and its evident role in analyzing and retaining information concerning behaviorally significant aspects of the visual environment. Earlier studies reported that single neurons of the ITC respond to behaviorally relevant dimensions of visual stimuli (Baylis & Rolls, 1986), manifest elevated firing rates across a retention interval, and immediately cease responding after the discriminative behavioral response has been completed
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study