1. **Enhanced Attention and Concentration**: Hypnosis works by guiding individuals into a highly focused mental state, where they can concentrate intensely on specific stimuli while filtering out distractions. Studies show that hypnosis can help individuals exhibit superior attentional filtering abilities, allowing them to focus and sustain attention more effectively [(Crawford, 1994)]. This heightened focus is attributed to changes in brain activity, particularly in the anterior cingulate cortex and prefrontal regions, which are associated with attentional control.

2. **Cognitive Plasticity and Neuroplastic Changes**: Hypnosis can induce plasticity changes in the brain, akin to those seen in meditation, though most people will find hypnosis a very easy process even when they find meditation very hard.  These changes include enhanced activation in regions tied to attention and concentration, such as the frontal and temporal lobes. Brain imaging studies have revealed that during hypnosis, there is increased functional connectivity between regions responsible for focus and cognitive control, leading to better sustained attention and cognitive performance [(Halsband et al., 2009)]

3. **Reduction of Cognitive Interference**: Hypnosis facilitates the ability to block out irrelevant stimuli, allowing individuals to maintain focus on the task at hand. This is particularly effective where distractions are common, as hypnosis enables a mental state where attention is highly concentrated and distractions are minimized [(Reilley & Rodolfa, 1981),(Raz et al, 2012)]

4. **Application in Learning and Performance**: Hypnosis has been effectively used to improve academic and cognitive performance by enhancing focus and reducing anxiety related to tasks like reading and studying. In educational settings, hypnosis has been found to improve reading performance and concentration in students by reinforcing mental clarity and motivation [(Fillmer et al., 1981)]

5. **Optimizing Cognitive Control and Reducing Mental Load**: Research shows that hypnosis can improve our individual skills in managing conflict between competing stimuli and maintain cognitive control during demanding tasks. This suggests that hypnosis could be especially useful in situations requiring sustained attention under pressure [(Egner et al., 2005)]

In summary, hypnosis enhances focus and concentration through deep relaxation, cognitive reconditioning, and neuroplastic changes that improve attentional control and reduce cognitive interference. These mechanisms make it a valuable tool for boosting mental performance across various contexts, from academic settings to high-stress environments.

References:

Helen J. Crawford et al. “Brain dynamics and hypnosis: attentional and disattentional processes..” The International journal of clinical and experimental hypnosis, 42 3 (1994): 204-32 . https://doi.org/10.1080/00207149408409352.

U. Halsband et al. “PLASTICITY CHANGES IN THE BRAIN IN HYPNOSIS AND MEDITATION.” Contemporary Hypnosis, 26 (2009): 194-215. https://doi.org/10.1002/CH.386.

R. R. Reilley et al. “Concentration, Attention, and Hypnosis.” Psychological Reports, 48 (1981): 811 – 814. https://doi.org/10.2466/pr0.1981.48.3.811.

A. Raz et al. “Hypnosis as a lens to the development of attention.” Consciousness and Cognition, 21 (2012): 1595-1598. https://doi.org/10.1016/j.concog.2012.05.011.

H. T. Fillmer et al. “Improving Reading Performance Through Hypnosis.” Community College Review, 9 (1981): 58 – 62. https://doi.org/10.1177/009155218100900211.

T. Egner et al. “Hypnosis decouples cognitive control from conflict monitoring processes of the frontal lobe.” NeuroImage, 27 (2005): 969-978. https://doi.org/10.1016/j.neuroimage.2005.05.002.