01/06/2026
Imaginary worlds | The “Black Box of Science” series
Imagine that you are performing the movement. Try to stay focused during the whole experiment. Keep your eyes closed until the end of each block.
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Healthy, right-handed participants sit in front of a 17-inch LCD monitor 60cm away and aligned to their eyes. They had no history of neurological, orthopedic, vascular, or muscular dysfunctions, nor spinal fractures or muscular issues affecting the upper limb.
The room remained silent. They received instructions from the researcher before the task started, then they heard a voice dictating numbers in a random sequence via headphones.
1, 2, 3, 1, 2, 2, 1, 2, 3…
The other group was instructed to press one of the three keys on the keyboard, as quickly as possible upon identifying the number.
This group should just imagine. The movement. The sensation. The visual experience.
There was a familiarization phase. Then the test phase started.
1, 2, 2, 1, 2, 3, 1…
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At some point, the participant hears two consecutive beeps. The first block is finished, time for some rest.
So, let’s take a short break.
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Motor imagery is “the mental practice of a motor task”. It involves both visual and kinesthetic components. Besides, evidence shows that it activates neural patterns that resemble those of motor ex*****on.
Similar mechanisms, some similar outcomes, such as learning. The essence of mental practice, through the lens of motor emulation theory, is “to induce an experience without the original input of external stimuli”.
“Evidence shows that motor imagery and motor ex*****on share brain mechanisms and provide activation of the same motor pathways”, explain Patricia Camargo, Paulo Cabral-Passos, and André Frazão Helene in their just-published paper (2026; see ref. 1).
“Improvements in motor function have been found in healthy subjects, and subjects in motor rehabilitation as a consequence of the practice”. Hence, the research “can help produce guidelines for participants to obtain the most from the practice”.
For example, training Brain-Machine Interfaces controlled by motor imagery can be improved. The same applies to motor imagery used in clinical conditions and even sports, as reported by studies with professional football players undergoing rehabilitation after injury (see ref. 2).
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About a year before, a professional football player concludes the first two segments of the physical rehabilitation program, and a 20-minute guided motor imaginary session. After the initial relaxation phase, the headphone repeats the instructions for a mental rehearsal of the balance tasks.
The routine was repeated with dozens of players over six sessions. The study contributed to our understanding of the impact of motor imagery vividness as part of rehabilitation protocols.
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The study investigates the similarities and differences between motor imagery and real ex*****on during a probabilistic sequence-learning task, using context trees — a familiar term in our series.
So, our brains learn probabilistic structures. That is done based on the preceding context, reflecting—in Duarte and colleagues’ 2019 experiment—the regularities of a context tree.
So, how closely motor imagery and real ex*****on would be, considering their own performance signature in face of this particular learning task?
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The rest period works to minimize fatigue and maintain attention. There were 5 blocks in total, 150 trials each. Quite a lot to imagine.
Context trees sustained stimuli sequences. Participants repeatedly pressed the key. Others worked with their imagination. Response Times were collected and compared in a series of analyses.
After all, Camargo and colleagues observed that imagery triggered learning along the blocks, progressively achieving lower response times. These results highlight how fruitful it can be when integrated to physical therapy and recovery, for example.
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Some theories propose that the emulation would provide our mental “planner” with predictions, enabling corrections and adjustment. Hence improving performance, preventing errors.
What is the difference between real and imaginary? Most of the time healthy, typical brains know how to differ. Even though, several parts of neural networks work similarly on both “situations”.
What other signatures can we find in our brain? Comment below, let us know your thoughts!
REFERENCES:
1. Camargo et al. (2026). Different factors determining motor ex*****on and motor imagery performance in a serial reaction time task with intrinsic variability. Brain Sciences, v. 16, n. 2, p. 147. DOI: 10.3390/brainsci16020147
2. Plakoutsis et al. (2025). Motor imagery ability and motor imagery perspective among professional football players. Healthcare, 13, 3045.
Background: Motor Imagery (MI) refers to the mental simulation of movement without physical ex*****on and activates brain areas involved in motor control. Its use in sports rehabilitation is growing due to its potential to promote recovery, reduce fear of re-injury, and maintain neuromuscular engage...