Motor imagery: never in your wildest dream

Article Abstract:

Angela Sirigu et al. established that mentally rehearsed movements are duplicated in actual execution and that imagined movements are governed by the same physical laws and limitations as actual ones. Effects of brain lesions on movement imaging depend on location. Lesions affecting the frontal-striatal circuit, including the motor cortex and basal ganglia, do not seem to affect the imaging of movements, while those in the parietal cortex do. This suggests that evaluation of motor movement occurs in the latter.

Research, Neural circuitry, Movement, Psychology of, Movement (Psychology), Imagery (Psychology)

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Somatotopy in the human supplementary motor area

Article Abstract:

The somatotopic organization of the supplementary motor area has been determined by electrical stimulation and cerebral blood flow studies conducted in monkeys and human subjects. Results have shown that the area is responsible for motor activity and choosing the most appropriate motor acts. It is also capable of performing higher functions such as motor intention and language. These findings distinctly distinguish the supplementary motor area from the primary motor area located caudal to it.

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Simulations of receptive-field dynamics

Article Abstract:

The results of a study by DeAngelis, Ohzawa and Freeman on the dynamic properties of receptive fields (RFs) in the visual system have shown an association between the temporal properties of RFs in the study and a mathematical model of the spatiotemporal properties of RF in the early stages of the visual system in mammals. The simulation results gathered by the model are in accordance with the experimental data of DeAngelis, Ohzawa and Freeman.

Analysis, Letter to the Editor, Visual pathways, Vision, Visual pathway

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