Related Experiment Video
Updated: Apr 27, 2026

Corticospinal Excitability Modulation During Action Observation
Published on: December 31, 2013
The neural antecedents to voluntary action: a conceptual analysis
Parashkev Nachev1, Peter Hacker
1a Institute of Neurology , University College London , London , UK.
Abstract:
The inferential standards for testing hypotheses are settled; those for constructing them rarely even discussed. If the fit to the data of a hypothesis matters, then so must its fundamental coherence. That is indeed prior to any other question. Here we make use of conceptual analysis in testing the coherence of hypotheses in cognitive neuroscience and apply it to the study of the antecedents to voluntary action. We show that many influential experiments in the literature are premised-often covertly-on erroneous conceptions that render their hypotheses incoherent. The inferences drawn from the data are therefore invalidated proximally to any objection empirical replication could counter. We further demonstrate the empirical consequences of these errors in generating artifactual observable effects that have no general significance and impede further progress. We conclude with a basic framework for constructing robust hypotheses in this difficult and important field.
Related Concept Videos
Hierarchy of Motor Control
Direct Motor Pathways
The corticospinal tract is responsible for the voluntary movement of the limbs and trunk. It originates in the cerebral cortex of the brain and descends through the cerebrum's internal capsule and...
Action Potential
Membrane potential in neurons
Neurons typically have a resting membrane potential of about -70 millivolts (mV). When they receive...
Somatosensory, Motor, and Association Cortex
Propagation of Action Potentials
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
Action Potentials

