3,432 results found
    1. Evolutionary Biology
    2. Genetics and Genomics

    Demographic reconstruction from ancient DNA supports rapid extinction of the great auk

    Jessica E Thomas et al.
    Reconstruction of great auk population dynamics suggests that hunting pressure alone could have been responsible for their extinction, demonstrating that even abundant, widespread species can be vulnerable to intense exploitation.
    1. Neuroscience

    Dopamine neurons drive fear extinction learning by signaling the omission of expected aversive outcomes

    Ximena I Salinas-Hernández et al.
    Dopamine signaling is necessary for normal fear extinction learning.
    1. Ecology

    Extinction risk and conservation of the world’s sharks and rays

    Nicholas K Dulvy et al.
    One-quarter of the Chondrichthyes have an elevated risk of extinction, mainly as a result of overfishing.
    1. Neuroscience

    Prefrontal dopamine regulates fear reinstatement through the downregulation of extinction circuits

    Natsuko Hitora-Imamura et al.
    Prefrontal dopamine regulates inhibition of fear extinction circuits in the infralimbic cortex and disinhibition of fear expression circuits in the amygdala, leading to fear reinstatement.
    1. Ecology

    Relative demographic susceptibility does not explain the extinction chronology of Sahul’s megafauna

    Corey JA Bradshaw et al.
    There is no relationship between the demographic susceptibility to extinction and the estimated extinction chronology among Sahul’s megafauna, suggesting that human choices, a species’ ecological requirements, and/or random climate variation instead determined the extinction chronology.
    1. Neuroscience

    Isoform-specific roles for AKT in affective behavior, spatial memory, and extinction related to psychiatric disorders

    Helen Wong et al.
    Murine behavioral testing and biochemical experiments reveal AKT isoform- and sex-dependent mechanisms regulating affective behavior, memory formation, and extinction.
    1. Neuroscience

    IGF-1 facilitates extinction of conditioned fear

    Laura E Maglio et al.
    Insulin-like growth factor-1 activates the prefrontal cortex and improves the extinction of aversive memories.
    1. Neuroscience

    Distinct signals in medial and lateral VTA dopamine neurons modulate fear extinction at different times

    Lili X Cai et al.
    Dopamine neurons in medial versus lateral VTA encode different signals during fear extinction, yet inhibition of both populations influences fear extinction, at different times.
    1. Neuroscience

    Distinct neuronal populations contribute to trace conditioning and extinction learning in the hippocampal CA1

    Rebecca A Mount et al.
    Large-scale imaging analysis of CA1 reveals that distinct neural networks are involved in trace conditioning versus extinction learning, shedding light on how the hippocampus encodes different types of memory.
    1. Neuroscience

    Extinction recall of fear memories formed before stress is not affected despite higher theta activity in the amygdala

    Mohammed Mostafizur Rahman et al.
    When the fear-enhancing effects of prior exposure to stress are absent, the expression of fear reflects normal neural activity in the medial prefrontal cortex, not stress-induced hyperactivity in the amygdala.

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