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Single-unit activity was recorded from the hand areas of the somatosensory cortex of monkeys trained to perform a haptic delayed matching to sample task with objects of identical dimensions but different surface features. During the memory retention period of the task (delay), many units showed sustained firing frequency change, either excitation or inhibition. In some cases, firing during that period was significantly higher after one sample object than after another. These observationsdoi:10.1073/pnas.93.19.10533 pmid:8927629 pmcid:PMC38421 fatcat:qjgcikwadncdhaiirfaltim3ii