Rajesh Singla

**2.3. Information transfer rate (ITR)**

106 Evolving BCI Therapy - Engaging Brain State Dynamics

• Number of unique commands

• Speed

methods.

• Accuracy

ITR (B) is defined as

**3. Conclusion**

The dynamic performance of any BCI can be evaluated by the information transfer rate (ITR)

**Figure 10.** (a) Target identification accuracy, (b) ITRs as functions of data length (from 1 to 4 s) calculated by different

\_\_\_\_ 1 − P

<sup>N</sup> <sup>−</sup> <sup>1</sup>)] (7)

as introduced in [58]. This parameter depends upon three factors regarding the BCI

P = classifier accuracy, i.e., how accurately the thoughts are translated into command.

SSVEP proves to be the most widely used paradigm for BCI used for various different application for healthy as well as locked in patients due to the fact that SSVEP-BCI's require minimum user training. This is because the subject does not have to regulate his/her own brain activity to provide controlling input for the task at hand. The subjects have to merely focus their attention towards the flickering targets which is then converted to machine command by a trained classifier.

N = number of mental tasks used in the BCI application under consideration.

B = V[log<sup>2</sup> N + P log<sup>2</sup> P + (1 − P) log2(

where, V = application speed in trials per second.

Address all correspondence to: singlar@nitj.ac.in

Associate Professor, Dr. BR Ambedkar NIT, Jalandhar, Punjab, India
