**5.3 Head shake-sensory organization test (HS-SOT)**

The Head Shake Sensory Organization Test (HS-SOT) is an expansion of the sensory organization test (SOT). HS-SOT has been proposed to increase the sensitivity of SOT incorporating head movements into the assessment for the two eyes closed conditions. The addition of the head shake provides an added challenge to the vestibular system, through stressing the Vestibulo-Ocular Reflex (VOR) [23].

*Sensory organization test report. The green bars represent the patient's normal results, the red bars indicate that the patient had an abnormal result in the tested condition and the area with dark gray bars indicates the* 

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**Figure 3.**

*normative limit. Courtesy: Interacoustics and Bertec.*

Researches indicated a deficit relative to evidence to the psychometric aspects of the HS-SOT, and appliance and value of this assessment in PCS and other clinical populations. Consequently, to evaluate the effectiveness of this tool, more studies must be done to evaluate the tool, prior to suggesting its use in clinical practice [22–24].
