PDF In order to be able to confidently assert that any RT speeding following a startling acoustic stimulus (SAS) is the result of activation in subcortical areas related to the startle reflex, a reliable indication that a startle reflex actually occurred is required. While the eye-blink response is typically used…
PDF This study is a replication of a previous experiment that investigated how movement-related brain activation changes as a go-stimulus approaches in time. The previous experiment used a startle to show that activity increased in short time prior to the go-signal. However, startle activity was not reported, so this was only…
In this study subjects performed a bimanual coordination task, where spontaneous transitions between states is observed at higher oscillation frequencies. For example, when limbs are moved in a parallel fashion (like windshield wipers on a car) a transition is seen at faster speeds whereby subjects spontaneously change to performing mirror-symmetrical…
PDF Seminal work by Georgopoulos and colleagues (1987) showed that reaction time (RT) increased when a rotational mental transformation had to be calculated prior to responding. A loud acoustic stimulus can be used to trigger prepared responses, so this effect was used in the current experiment to determine how preparatory activation levels in…