Bimanual dyskinesis is refered to mirror movement that are involuntary symmetrical movements of one side of the body that mirror voluntary movements of the other side. The affected individuals unable to perform independent actions with the two hands or to perform purely unimanual movements. They usually have hand clumsiness and pain in the upper limbs during sustained manual activities.

This mostly affects the top half of the body but can also affect the bottom half. Walking may become more difficult, as one leg will move at the same time as the other. Playing a musical instrument such as the piano may become very difficult, as the process involves doing different things with each hand.

In humans, execution of unimanual movements requires lateralized activation of the primary motor cortex, which then transmits the motor command to the contralateral hand. Loss of this lateralization results in mirror movements. Congenital mirror movement disorder (CMM) is a rare genetic disorder transmitted in autosomal dominant manner in which mirror movements are the only clinical abnormality. 

Bimanual synkinesis be associated with several diseases including:

Kallmann syndrome

Kallmann syndrome (KS), a combination of congenital hypogonadotropic hypogonadism (gonadotropin-releasing hormone (GnRH) deficiency) and decreased/absent sense of smell, results from disturbed intrauterine migration of GnRH neurons from the olfactory placode to the hypothalamus. Patients with KS usually lack puberty, but the reproductive phenotype (structural, developmental, or functional anomaly of the reproductive organs) may vary from severe hypogonadism (cryptorchidism or micropenis in male infants) to reversal of hypogonadotropism later in life. Associated phenotypic features include a feature called bimanual synkinesis.

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Hypogonadotropic hypogonadism ―sourced from Wikipedia licensed under CC BY- SA 3.0
Congenital mirror movement disorder ―sourced from Wikipedia licensed under CC BY-SA 3.0
One hand clapping: lateralization of motor control ―by Welniarz et al. licensed under CC BY 4.0
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