Mechanisms underlying long-term chromatic adaptation

Long-term renormalization of chromatic mechanisms following cataract surgery.

The optical density of the human crystalline lens progressively increases with age, the greatest increase in the visible spectrum being at short wavelengths. This produces a gradual shift in the spectral distribution of the light reaching the retina, yet color appearance remains relatively stable across the life span, implying that the visual system adapts to compensate for changes in spectral ...

V1 mechanisms underlying chromatic contrast detection.

To elucidate the cortical mechanisms of color vision, we recorded from individual primary visual cortex (V1) neurons in macaque monkeys performing a chromatic detection task. Roughly 30% of the neurons that we encountered were unresponsive at the monkeys' psychophysical detection threshold (PT). The other 70% were responsive at threshold but on average, were slightly less sensitive than the mon...

Post-receptor mechanisms underlying striatal long-term depression.

Extracellular and intracellular recordings were obtained from striatal neurons in a brain slice preparation in order to characterize the post-receptor mechanisms underlying striatal posttetanic long-term depression (LTD). Striatal LTD was blocked in neurons intracellularly recorded either with 1,2-bis (o-aminophenoxy)-ethane-N,N,N',N'-tetraacetic acid (BAPTA) or with EGTA, calcium (Ca2+) chelat...

Mechanisms Underlying Different Forms of Hippocampal Long-term Potentiation

Expression mechanisms underlying long-term potentiation: a postsynaptic view.

This review summarizes the various experiments that have been carried out to determine if the expression of long-term potentiation (LTP), in particular N-methyl-D-aspartate (NMDA) receptor-dependent LTP, is presynaptic or postsynaptic. Evidence for a presynaptic expression mechanism comes primarily from experiments reporting that glutamate overflow is increased during LTP and from experiments s...