Their power of localization is retained but error exists to the side touched and they often refer the irritation to the corresponding part of the limb.

Overall, even though different author's definition differs on points such as the type of stimulus, and the symmetry between the site of the stimulus and the seat of its localization, they all agree that an essential feature of allochiria is the deflection of a sensation to the wrong side of the body, which is true allochiria.

In none of these definitions is any stress laid on the state of the patient's knowledge of a right or left side and the symptoms are seen as an error in localization.

[10] There is in the patient's mind doubt or error as to the side touched while sensibility including the power of localization is otherwise retained.

Allochiria has been described as occurring in nerve lesions, Hemiplegia, disseminated sclerosis Multiple sclerosis, tabes dorsalis, unilateral injury to the spinal cord, Ménière's disease, hysteria, symmetrical gangrene,[11] and in connection with touch, pain, the "muscle sense," the temperature sense, sight, smell, taste, hearing, and the electrical reactions.

Allochiria is marked to have connections with a variety of senses and sometimes only certain kinds of stimuli can arouse the appropriate feeling of one sidedness.

The central fact is that an electrical stimulus may manifest its effect at a distant part of the nervous system.

The term allesthesia was introduced by T. Grainger Stewart in an article published in the British Medical Journal in 1894.

[12] Achiria is referred to as simple allochiria and is the term proposed to show the failure to regard feelings of sidedness or handedness.

For the motor component, if a patient is asked to carry out any movement with the limb in question he is unable to do so unless is indicated in some other way than by the use of the words right and left.

Reason for this is that he has lost the knowledge of the meaning of these words either altogether or at all events when they are applied to limbs concerned.

For the introspective cases the patient can appreciate a given feeling of sidedness only when the opposite limb is moved or stimulated.

A defect of mental representations may lead the patients to transpose all the elements to the ipsilesional side in drawing tasks.

[3] In these drawing and memory tasks, patients with allochiria have a tendency to place all of the hours to the right half of the clock.

Even though the patient could verbally express that the clock face has a left side, he or she would fail to notice that the drawing was incomplete.

This implies that drawing tasks can play an important role in differentiating the specific impairment of the brain lesion, and not just saying that a patient has dementia.

In absence of knowledge there are a number of ways in which the various symptoms may be overlooked or misinterpreted and as the condition goes frequently unrecognized.

One rare example in medicine that causes a wrong diagnosis of allochiria is due to the unawareness of a few simple facts than to any failure in judgment.

Recognition of the allochiria may throw light upon a number of symptoms that would otherwise be misinterpreted as paresis, aboulia, and defective sensibility.

This enables a correct analysis to be made of the precise defects present and serve as a guide toward the original focus of the whole affection and proving an important step in the exact psychological diagnosis that is an essential preliminary to the scientific treatment of hysteria.