Joint attention is both receptive and expressive. It has two distinct components: responding to someone else’s bid for shared attention (receptive) and initiating a bid to share attention with someone else (expressive). These two sides develop on different timelines, activate different brain regions, and play different roles in language development and autism screening.
Receptive Joint Attention: Following Someone’s Lead
Receptive joint attention, often called “responding to joint attention” (RJA), is the ability to follow another person’s gaze, point, or voice to look at the same thing they’re looking at. When a parent says “Look!” and points at a bird, and the child turns to look at the bird, that’s receptive joint attention in action. The child is receiving a social cue and responding to it.
By about 9 months, babies can follow an adult’s attention when the adult both looks and points at something. By 12 months, most children can follow a head turn and gaze direction alone, without any pointing gesture to help. This progression matters because it shows the child is becoming increasingly sensitive to subtle social signals. In children with autism, only about 20% can follow an adult’s gaze when the target object isn’t already in their visual field, compared to the majority of typically developing children.
Expressive Joint Attention: Starting the Interaction
Expressive joint attention, known as “initiating joint attention” (IJA), is when a child actively directs someone else’s attention toward something. A toddler who spots a dog at the park, points at it, then looks back at their parent to make sure the parent sees it too is using expressive joint attention. The key ingredients are the gesture (pointing, holding up an object) combined with checking back with the other person through eye contact.
This side develops in stages. As early as 4 months, infants look at a parent and make sounds or movements to get attention. By 15 months, children show objects to a parent. By 18 months, they point at things specifically to share interest, not just to request something. That distinction is important: pointing at a cookie because you want it is a behavioral request, but pointing at an airplane because it’s cool and you want someone else to see it is expressive joint attention.
Different Brain Systems for Each
The two types of joint attention aren’t just behavioral categories. They recruit different neural pathways. Responding to a joint attention bid activates a region in the front of the brain involved in understanding other people’s mental states. Initiating joint attention, by contrast, recruits areas associated with reward processing and goal-directed planning. Both types activate shared social brain regions, but the distinct networks suggest they represent genuinely different cognitive processes, not just two versions of the same skill.
How Clinicians Measure Each Type
Standardized tools like the Early Social Communication Scales (ESCS) measure receptive and expressive joint attention separately. For receptive joint attention, an examiner points to pictures in a book or toward a poster on the wall while calling the child’s name. The score reflects how often the child follows the point or gaze direction. For expressive joint attention, the examiner watches whether the child spontaneously uses eye contact while holding a toy, shifts their gaze between an interesting object and the examiner’s face, points at things, or holds objects up to show them.
This separation is clinically meaningful because a child can be strong in one type and weak in the other. Some children readily follow where you point but rarely initiate sharing on their own. Others are eager to direct your attention but struggle to pick up on your cues.
The Link to Language Development
Both types of joint attention predict later language skills, but in different ways. In children at risk for autism and those with developmental delays, receptive joint attention scores significantly predicted expressive vocabulary outcomes. Interestingly, initiating joint attention scores alone did not predict language as strongly in these groups. However, the amount of time children spent actively engaged in shared attention with a partner (not just performing discrete skills but staying in a back-and-forth exchange) accounted for three times as much of the variation in expressive language as both joint attention skill types combined.
This suggests that while the individual skills matter, what really drives language growth is the sustained, mutual quality of shared attention, not just whether a child can follow a point or initiate one in isolation.
Why the Distinction Matters for Autism Screening
Deficits in joint attention are among the strongest early markers for autism spectrum disorder, and the two types flag risk at different ages. Difficulties initiating joint attention at 8 months predict early autism markers at 18 months. Difficulties responding to joint attention at 12 months are an even more statistically significant predictor of autism symptoms at 18 months. Joint attention variables overall were far stronger predictors of early autism signs than behavioral request variables, which showed little or no predictive ability.
This is why developmental screenings pay close attention to both sides. A child who doesn’t follow a parent’s point at 12 months and a child who never holds up a toy to share at 15 months are showing different patterns, but both warrant attention. Targeting the specific type of joint attention a child struggles with allows therapists to tailor intervention activities, whether that means practicing following a caregiver’s point or encouraging a child to initiate sharing by showing objects and checking for eye contact.