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  2. Hippocampal subfields - Wikipedia

    en.wikipedia.org/wiki/Hippocampal_subfields

    The hippocampal subfields are four subfields CA1, CA2, CA3, and CA4 that make up the structure of the hippocampus. Regions described in the hippocampus are the head, body, and tail, and other hippocampal subfields include the dentate gyrus , the presubiculum , and the subiculum .

  3. Trisynaptic circuit - Wikipedia

    en.wikipedia.org/wiki/Trisynaptic_circuit

    It has been proposed that the trisynaptic circuit is responsible for the generation of hippocampal theta waves. These waves are responsible for the synchronization of different brain regions, especially the limbic system. [9] In rats, theta waves range between 3–8 Hz and their amplitudes range from 50 to 100 μV.

  4. Hippocampal sclerosis - Wikipedia

    en.wikipedia.org/wiki/Hippocampal_sclerosis

    Hippocampal sclerosis is the most common brain abnormality in those with temporal lobe epilepsy. [16] Hippocampal sclerosis may occur in children under 2 years of age with 1 instance seen as early as 6 months. [17] About 70% of those evaluated for temporal lobe epilepsy surgery have hippocampal sclerosis.

  5. Hippocampus - Wikipedia

    en.wikipedia.org/wiki/Hippocampus

    The hippocampus (pl.: hippocampi; via Latin from Greek ἱππόκαμπος, 'seahorse'), also hippocampus proper, is a major component of the brain of humans and many other vertebrates. In the human brain the hippocampus, the dentate gyrus, and the subiculum are the components of the hippocampal formation located in the limbic system.

  6. Occupancy frequency distribution - Wikipedia

    en.wikipedia.org/wiki/Occupancy_frequency...

    In macroecology and community ecology, an occupancy frequency distribution (OFD) is the distribution of the numbers of species occupying different numbers of areas. [1] It was first reported in 1918 by the Danish botanist Christen C. Raunkiær in his study on plant communities. The OFD is also known as the species-range size distribution in ...

  7. Neuropil - Wikipedia

    en.wikipedia.org/wiki/Neuropil

    The formula predicted an optimal brain with 3/5 (60%) of its volume occupied by neuropil. Experimental evidence taken from three mouse brains agrees with this result. The "fraction of wire is 0.59 ± 0.036 for layer IV of visual cortex, 0.62 ± 0.055 for layer Ib of piriform cortex, and 0.54 ± 0.035 for the stratum radiatum of hippocampal ...

  8. Theta wave - Wikipedia

    en.wikipedia.org/wiki/Theta_wave

    Hippocampal theta waves, with a frequency range of 6–10 Hz, appear when a rat is engaged in active motor behavior such as walking or exploratory sniffing, and also during REM sleep. [3] Theta waves with a lower frequency range, usually around 6–7 Hz, are sometimes observed when a rat is motionless but alert.

  9. Alzheimer's Disease Neuroimaging Initiative - Wikipedia

    en.wikipedia.org/wiki/Alzheimer's_Disease...

    Hippocampal volume is the first imaging biomarker to be qualified, with the help of ADNI data, by the European Medicines Agency to select patients for clinical trials. [42] ADNI also contributed to the development of a standardized technique to manually measure hippocampal volume from MRI scans for use in clinical trials. [43] APOE ε4 allele.