Many behaviors are remarkable for the orderly sequencing, precise timing, and appropriate
strength of their constituent units. In certain invertebrates, the neural circuitry that participates …

Intracellular recordings were made from the somata of central neurons in semi-intact
preparations in order to trace sensory pathways in the phasic extensor system. 2. The tonic …

Crayfish possess two pairs of giant axons that travel the length of the central nervous
system. The giant cells are command neurons, which produce, with a single impulse, a …

METHODS Crayfish(P1-ocambarus clarltii) were maintained and prepared for experiments
as described in the first paper in this series (28). The abdomen was pinned ventral side up in …

Electromyograms (EMGs) from phasic abdominal muscles of unrestrained and variously
restrained crayfish were used to study the involvement of sensory information in phasic …

The modal escape response of a wellrested crayfish to a tap on the abdomen consists of an
initial lateral giant-mediated flexion, a movement-triggered reflex extension, and then a …

1. Habituation of the lateral giant fibre escape response in the crayfish to repetitive tactile
stimuli is believed to result from homosynaptic depression at the first synapse of the reflex …

The giant interneurons of the crayfish nerve cord are well-known mediators of fast tail
flexions," tailflips," that propel animals through the water away from danger. More recent …

Intracellular recordings from neuronal somata and extracellular recordings from peripheral
nerves were used to study the effects of impulses in the giant escape command interneurons …

1. A circuit that produces a 70-100 ms IPSP in the crayfish giant motoneuron is described.
The IPSP is produced by a disynaptic pathway from the nongiant fast flexor motoneurons to …