Genitally does it

Article Abstract:

A number of theories have been put forward to try to explain why the genitals of male insects are so complex. Recent research has favoured the view that genital structures diverged through the sexual selection that takes place after insemination for any device that boosts fertilization success. It is also worth investigating the possibility that male genital modifications in some polyandrous species include devices that indicate to the female that conspecific sperm is being delivered.

Insects, Anatomy

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Pathogenesis of two axonopathies does not require axonal neurofilaments

Article Abstract:

Neurofilaments are an important component in the axonal cytoskeleton, and abnormal accumulation is a dominant feature of the cytopathology seen in certain neurodegenerative diseases. A widely held pathogenesis model involves disrupted neurofilaments acting as a common toxic intermediate. However it is now shown that two mouse neurodegenerative disease models, progress unabated on a transgenic background where the neurofilaments are withheld from the axonal compartment.

Observations, Cytoskeleton, Cytoplasmic filaments

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Automatic alerting does not speed late motoric processes in a reaction-time task

Article Abstract:

Automatic alerting is the name given to a brief rise in arousal, and this has been attributed as the cause of a reduction in the latency of a response to a signal in a choice reaction time-task when there is an accessory stimulus. The motoric hypothesis argues that this facilitation is linked to a late and low level process, but this theory appears invalidated by an experiment on mean reaction times that indicates that an earlier stage may be involved.

Reaction time, Reaction time (Psychology), Stimulus compounding

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