## 1 Introduction  
Robust hand function is indispensable for our daily life and work. It is also of crucial significance in neurorehabilitation, for the impairment of hand function that is required for performing delicate movements makes it difficult to complete daily activities, such as eating, dressing, and return to work [1, 2]. During these activities, the human body is a specific mental category within which interoceptive and exteroceptive signals are integrated and processed faster comparing surrounding objects of similar complexity [3, 4], and the human mind creates and stores distinct representations of the body and peripersonal objects [5, 6, 7]. Body representation was not only found to be misperceived in healthy adults [8], but also distorted in numerous pathological conditions, including spinal cord injury [9], amputation [10], cerebral palsy [11], and stroke [12, 13]. It has been assumed that the plasticity of body representations is important concerning functional motor improvement by its integration with the motor control system, possibly through the activation of the mirror neuron system secondary to the visuomotor feedback provision [13]. Although body representation deficits are not rare in stroke patients [6; 14; 15], evidence that shows the plastic change of body representations in stroke patients is so far scarce--even pilot studies in healthy people are insufficient. Recent evidence suggested that there are at least three distinct types of body representation: body schema, body structural descriptions, and body semantics [14; 16; 17]. Body schema encompass a dynamic representation of the relative position of body parts derived from multiple sensory and motor inputs (e.g., proprioceptive, vestibular, tactile, visual, and efference copy) that interacts with the motor system in the genesis of actions. Body structural descriptions encompass topological maps of locations derived primarily from visual input that define body part boundaries and proximity relationships. Body semantics are lexical-semantic representations of the body including body part names, functions, and relations with artifacts [14; 16; 17]. Despite this triadic taxonomy and previously used dyadic taxonomy, which distinguishes between body schema and body image (probably the combination of body structural description and body semantics), [PERSON] and [PERSON] developed an implicit body representation underlying position sense by isolating and measuring the perceived location of landmarks in healthy people [18]. Participants in their research were asked to use a baton to indicate with their right hand ten the landmarks of their occluded left hand: the knuckle at the base of each finger and the tip of each finger. The perceived locations of landmarks were captured as still JPEG images that depicted the implicit perceptual maps of hand structure that were constructed and compared to the actual hand structure. These maps were highly distorted in a stereotyped way across participants, with the perceived upper part of the hand represented as wider and shorter than the real hand [18], neglecting the part between knuckles and wrist joint. Repetitive peripheral magnetic stimulation (rPMS) is a unique non-invasive treatment method that was developed for therapeutic neuromodulation in movement disorders by activating proprioceptive afferents [19; 20; 21]. rPMS can be performed to safely stimulate deeper regions of tissue with little activation of cutaneous receptors and has been proven as a feasible approach for improving activities of daily living and functional abilities in people with hemiplegic paralysis [21; 23]. A recent study found that single-session rPMS applied to stroke patients' upper limbs could alleviate spasticity in both elbow flexors and wrist flexors, and upper limb function measured according to the Fugl-Meyer assessment was improved [24].