Introduction 

Imagine being aware, able to think and feel, yet completely unable to move, smile, or speak to show how you feel?

Locked-In Syndrome (LIS) is a rare neurological condition caused by paralysis of nearly all voluntary muscles, often retaining only vertical eye movements and blinking. Even the total loss of eye movement and blinking occurs in more severe total LIS (TLIS) cases. 

Despite being fully conscious, alert, with intact cognitive abilities capable of thinking and reasoning, individuals with LIS are trapped in unresponsive bodies, unable to move, speak, or express themselves in any traditional ways. 

Creating profound challenges for emotional and affective communication, in how someone shows feelings like joy, sadness, or frustration. Families and caregivers may easily assume emotional flatness due to the lack of facial expression or speech, even though the person remains with full emotional capacity inside. 

These can induce significant feelings of isolation, emotional distress, and misunderstanding among individuals with LIS. Recent innovations are beginning to bridge this gap. Advancing assistive technologies, such as brain-computer interfaces (BCIs), eye-tracking communicative devices, and emotion-sensitive artificial intelligence, are bringing people with LIS towards the dawn of connecting and sharing their inner world. 

This article explores the emotional and affective challenges faced by the LIS population, along with emerging innovative tools and strategies that help restore the ability of self-expression. This can enable sufferers to be truly seen and heard, creating a more empathetic environment and improving the quality of life for those with LIS. 

The power of emotional expression

What are emotions and affective expressions?

Emotions are complex mental and physical responsive patterns to events or experiences that shape our reaction to the outside world, including feelings like joy, love, excitement, sadness, anger, and fear.¹ 

Affective expressions, on the other hand, are the visual or physical signs of emotions, such as smiling, crying, laughing, or frowning. These expressions facilitate the communication of our feelings to others, even non-verbally, without words. Typically conscious and automatic, they are the key to effective human connection. 

Why is expressing emotions important?

Emotional expression is crucial for mental health, personal identity and social connections. As a common coping strategy, particularly during stressful times, it can help to release inner tension. Small actions like sending a heart and hug emoji to show love and care on texts can promote understanding, tighten social bonds with others, and reduce loneliness. Trust and empathy can be built in relationships when emotions are expressed clearly. 

Long period emotional hiding or suppression can internalise and intensify stress, leading to misunderstanding and miscommunication, not only disrupting interpersonal relationships, but even resulting in isolation, anxiety and depression^.2  

How do people usually share emotions?

Affective expressions typically encompass a wide variety of visible emotional signs, ranging from facial expressions, tone of voice, speech, gestures, posture, and body language. While a smile conveys warmth or kindness, a trembling voice demonstrates sadness or fear. Touches, like a comforting hug, can communicate emotion deeply. Emojis, voice notes, and video calls can add extra emotional depth to the digital world nowadays, allowing people to gain a deeper understanding of how others feel and respond with compassion. 

Challenges for LIS patients in sharing emotions 

Physical barriers

Physical barriers are one of the most significant challenges in expressing emotions for the LIS population. Due to the loss of facial movements, gestures, and speech caused by near-total paralysis, natural ways of feeling, communicating and emotional signals like smiling, crying, raising eyebrows, or changing of speech tone, become severely limited and almost absent. 

These physical disconnections can easily be mistaken for emotional unresponsive or detached. Not only can they induce profound isolation and emotional frustration, but also intensify the difficulties for others to truly recognise and respond to their emotional world. 

Communication struggles

Communicative struggles are a major barrier to emotional expression amongst those with LIS. Vertical eye movement and blinking are often the primary and only means of communication for most LIS individuals. For instance, a patient with LIS may want to say ‘I’m glad to have you’, but is only capable of blinking once at a time for an alphabet. Relying on these lower-tech methods (e.g. blinking or looking up and down for yes/no) can be slow and energy-consuming, making quick and natural complex emotional expressions like joy, grief, or frustration significantly difficult. 

Simple emotions that others express effortlessly could require immense effort and time for someone with LIS to communicate, if still capable. A deep emotional toll can also be likely for patients, due to feeling trapped in a sharp mind, yet unable to reflect on their inner vitality. 

Emotional and social impact

The inability to physically express emotions among individuals with LIS can lead to profound emotional and social consequences. With the inner cognition and emotional world of those with LIS often gone non-communicated, this can make it difficult for others to recognise their feelings and respond to them appropriately. 

The disconnection can make them feel trapped, causing deep frustration, loneliness, and a sense of emotional isolation. This lack of meaningful connections and interactions may even extend to the risk of reduced self-esteem, depression, and anxiety in the long run. 

Socially, LIS may feel left out and misunderstood, even when surrounded by family or caregivers. Relationships suffer even more among the LIS population, not because of the lack of love and care, but the absence of mutual emotional exchange and weakening connections.^3,4

Exciting innovations helping LIS patients express emotions 

Eye-tracking devices and brain-computer interfaces 

As technology advances, eye-tracking devices and brain-computer interfaces (BCIs) are transforming communication for the LIS population. Eye-tracking devices and software allow users to control a computer cursor or laser pointer, enabling basic conversations and emotional expression through direct selection of words, phrases, and emojis, using only eye movements or slight finger twitches in certain cases. This allows for more efficient and expressive communication.^5,6 

Brain-Computer Interfaces (BCIs) go a step further. With the use of electroencephalography (EEG), BCIs are devices that detect brain signals (cortical potentials). By training LIS individuals to produce a desired letter in response, words, sentences, and even emotional tones are created through thoughts and digital commands, into functional messages or speech for smooth and more effective communications, even when there is a total loss of voluntary movement. 

There is already the case of a man with complete locked-in syndrome, who had lost entire control of his eye muscles due to an advanced stage of amyotrophic lateral sclerosis (ALS). He was able to communicate with his family using the functional near-infrared spectroscopy (fNIRS) for the first time after a few years of being completely locked-in.^7,8 

Smart technology with AI

Smart technology powered by artificial intelligence (AI) is also transforming communication among individuals with LIS.  Innovative technological tools like BCIs can detect brain signals and convert them into text or speech, allowing for the expression of thoughts without physical movement. 

AI-enhanced algorithms can further speed up a computer’s recognition and matching of an individual's unique brain signals for speech with accuracy, for a personalised bank of words, vocabularies and phrases for ease of communication.⁹

Some multi-modal AI systems can analyse a variety of inputs, such as subtle cues like facial expressions, changes in pupil sizes, physiological responses like heart rate, and skin temperature, to detect, recognise, and even monitor the emotional state of a person with LIS, enabling early intervention and personalised support.¹⁰  

Virtual reality (VR) and avatars

Virtual reality (VR) and avatar-based technologies are emerging as powerful tools for LIS individuals to express themselves. VR can create digital “selves” (avatars), allowing individuals with LIS to smile, ‘speak’, move, or demonstrate their emotions virtually. 

Visiting virtual immersive spaces like libraries, parks, can further increase emotional connection and reduce loneliness by offering chances for those affected to connect with others and regain a sense of social presence. 

Support for emotions and well-being

Emotional and well-being support to individuals with LIS typically requires a patient-centred, compassionate approach. Speech and language therapists can train families and caregivers in recognising and understanding subtle signs of emotions, like eye movements, facial and finger twitches, to facilitate the conveyance of emotions and maintenance of intimacy. 

Regular emotional check-ins, even through eye movements or assistive technology, are still helpful to validate their feelings and reduce isolation. Psychological interventions like counselling sessions and psychotherapies can also be adapted to their communication abilities and targeted to address their anxiety, frustration, and depression. This encourages consistent social interactions, utilising personalised communication systems for a better mood. 

Summary 

The challenges in emotional expression for individuals with Locked-In Syndrome are often immense. The loss of facial expressions, speech and body language can make it difficult for others to recognise and respond to their emotional needs, resulting in isolation, misunderstanding, and diminished quality of life for individuals with LIS, due to the loss of connection. 

Ongoing assistive communication technological advancements – such as eye-tracking, emotion-sensitive AI, and brain-computer interfaces- can all undoubtedly offer hope for more effective tools assisting with emotional communication. It is important to raise greater awareness of the future of more affordable, user-friendly and personalised communicative innovations. Emotional connection, humanity, and sense of existence amongst the LIS population can be restored, to ensure their dignity and emotional lives are being valued, seen and heard, for an improved well-being and quality of life.