Buzz
Tickling a baby’s foot might make them wiggle their toes, but they don’t necessarily recognize the source of the sensation. A recent study published in Current Biology reveals that infants under four months old struggle to connect tactile sensations to the external world.
To explore how babies perceive touch, researchers used remote-controlled stimuli on their feet. Adults often misidentify the source of touch when their limbs are crossed due to conflicting visual and tactile cues. Similarly, 6-month-old babies were confused when their crossed feet were touched, identifying the correct source only half the time. In contrast, 4-month-olds accurately identified the sensation’s origin, indicating they don’t yet integrate tactile sensations with visual input.
An infant experiencing tactile buzzes on their feet. Image Credit: Jannath Begum Ali
“These remarkable findings suggest that, in the early months of life, human infants experience a form of tactile solipsism,” the researchers explain, referencing the philosophical concept that reality is confined to one’s own mind. Infants initially perceive touch solely in relation to their own bodies, without connecting it to external causes. By around six months, babies start to develop a broader perspective, aiding them in better comprehending their surroundings.
"We propose that for very young infants, touch is experienced purely as a bodily sensation, disconnected from visual, auditory, or even olfactory stimuli," says study co-author Andrew Bremner of Goldsmiths, University of London, in a press release. "They don’t link tactile experiences to objects they see. This creates a sensory world that feels quite alien—where touch exists in isolation from other senses."
