The early release of actions by loud sounds in muscles with distinct connectivity
Exp Brain Res. 2014-08-21; 232(12): 3797-3802
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1. Exp Brain Res. 2014 Dec;232(12):3797-802. doi: 10.1007/s00221-014-4074-y. Epub
2014 Aug 21.
The early release of actions by loud sounds in muscles with distinct
Marinovic W(1), de Rugy A, Riek S, Tresilian JR.
(1)Centre for Sensorimotor Performance, School of Human Movement Studies, The
University of Queensland, Brisbane, Australia, .
The presentation of an unexpected and loud auditory stimulus (LAS) during action
preparation can trigger movement onset much sooner than normal. Recent research
has attributed this effect to the activation of reticulospinal connections to the
target muscles. To our knowledge, no studies have investigated the effects of LAS
presentation in tasks requiring the simultaneous activation of muscles with
different connectivity to motor areas of the brain. Here, we sought to establish
the importance of muscle connectivity by asking participants to contract the
orbicularis oris and abductor pollicis brevis muscles simultaneously. A LAS was
randomly presented at 200 ms prior to the expected time of movement onset in an
anticipatory timing task. We show that muscles controlled via bulbar connections
to reticular formation can be triggered early by sound as much as muscles with
spinal connections to the reticular formation.
PMID: 25142152 [Indexed for MEDLINE]