# LENA Foundation

The Language Environment Analysis (LENA) is a nonprofit organization that created a technology system consisting of a LENA device, patented processing software, and secure, cloud-based data access. LENA technology is used in programs by community organizations worldwide to encourage interactive talk between children and caregivers. As of 2025, LENA has been used in over 500 organizations across 40 countries.
The LENA System is also used by researchers at universities such as Harvard, MIT, Brown University and Stanford University, hospitals, and other research institutions, where it has been used to study subjects such as how language builds children's brains, autism, child language acquisition, and communication in deaf and hard of hearing families.

## History

The LENA Research Foundation, a nonprofit organization, was created in 2009 through a donation of assets of Infoture Inc. by Terrance "Terry" and Judith "Judi" Paul, who were also majority owners of Renaissance Learning Inc. (RLI).
In 1998, Terry Paul, founder of Renaissance Learning Inc., read Meaningful Differences in the Everyday Lives of Young American Children by Betty Hart and Todd Risley. This longitudinal study highlighted the correlation between the number of words spoken to children from birth to age three and their language ability and IQ at age three. Inspired by these findings, Paul founded Infoture, Inc. in 2004 to research and develop the LENA System.
In 2004 Terry started Infoture, Inc. and hired a team to conduct research and development work for the LENA System. Infoture launched a pilot version of the LENA System in February 2006. In February 2009, the Pauls donated assets from Infoture and gifted $2 million to create the LENA Research Foundation, a nonprofit organization. In January 2018, the organization changed its name to LENA and adopted the tagline "Building brains through early talk."

## Philosophy

LENA's organizational goals are based on research that suggests an increase in a child's conversational engagements in the first four years of life leads to an improved position in academia and society. One such study includes research from Harvard University showing that interactive talk between children and caregivers is one of the most important factors affecting early brain development. New research from MIT published in February 2018 confirmed that conversational turns are responsible for activation in Broca's area in children. LENA has several programs designed to encourage interactive talk between children and caregivers, including programs aimed at parents, childcare providers, and home visitors.

## Scientific background

A growing body of research shows that early childhood contains "critical periods" for tasks such as language acquisition, meaning that the first three years are a once-in-a-lifetime opportunity for development. Early childhood development drives success in school and life, fostering cognitive skills like attentiveness, self-regulation, motivation, and sociability. Interactive talk—and more specifically, conversational turns—have proven to be a key factor in stimulating brain growth during these important years, according to the Center on the Developing Child at Harvard University. Additionally, longitudinal research from LENA has found that the amount of conversation children experience between the ages of 18 and 24 months is related to their IQ, verbal comprehension, and language skills during adolescence. Research has shown investments in young children can lead to reductions in criminal activity later in life, 13% returns on investment annually, and positive effects that last for several generations.

## LENA System

LENA stands for "Language Environment Analysis". LENA technology provides more than 25 different metrics on the natural language environment of children, including estimates and percentile scores for adult words spoken to the child, conversational turns, and child vocalizations. The system also generates an automatic expressive language developmental age and percentile score based on a child's voiceprint.

### Core Language Metrics

* Adult Word Count (AWC): The AWC is the number of words a child hears from an adult within a specific period. LENA provides breakdowns of AWC in five-minute, hourly, daily, and monthly reports.
* Conversational Turns (CTs): CTs occur when a child vocalizes (initiates), and an adult responds, or an adult speaks (initiates) and a child responds. Each time that happens one turn is counted. CTs are one of the only ways to measure engaged interaction with a child. LENA offers breakdowns of CTs in five-minute, hourly, daily, and monthly reports.
* Child Vocalizations (CVs): A CV is counted when a child's speech of any length is surrounded by greater than 300 milliseconds of silence or other sound that is not child speech. CVs do not include cries or vegetative sounds. LENA provides breakdowns of CVs in five-minute, hourly, daily, and monthly reports.

## How LENA Works

A parent or teacher places a LENA device in his or her child's LENA vest and records an entire day of the child's sound environment. The device is then connected to a computer with special software that processes the recording into data metrics including the child's exposure to verbal stimulation, the number of child utterances, and other information. As pediatricians do with a child's height and weight, the system also generates percentile scores comparing the child's vocalizations with those of other children of the same age.

## Product line
### LENA Start

LENA Start is a program for parents that uses regular feedback from the LENA System plus 13 weekly group sessions to help improve the home language environment. Since its introduction in 2015, LENA Start has been implemented by school districts, library systems, and other types of organizations in Huntsville, Alabama, San Mateo County, California, Ames, Iowa, Longmont, Colorado, Minneapolis, Minnesota, and other sites across the country. Texas Children's Hospital is the first regional healthcare center to adopt the model. In October 2020 amid the restrictions related to the COVID-19 pandemic, Read Aloud Delaware began a virtual LENA Start program with families statewide. Parents are provided with feedback and participate in one-hour Zoom workshops each week during the 10-week program. LENA facilitators offer techniques to help them increase their children’s exposure to oral language while wearing the 'talk pedometers.' $^{[37]}$

### LENA Grow

LENA Grow is a professional development program for teachers who work in early childhood classrooms. According to LENA's website, "LENA’s talk reports for teachers focus primarily on conversational turns, a strong measure of interactive talk." Training teachers on how to increase conversational turns is important because children can spend up to 60 percent of their time in childcare. The program was first piloted in Escambia County, Florida before launching at sites around the country.

### LENA Home

LENA Home is a supplement to existing parent coaching curricula. Typically, home visitors facilitate the use of the LENA System to help parents track their progress towards increasing interactive talk in their homes.

### LENA SP

LENA SP is the version of LENA designed for researchers and language professionals to use.

### Developmental Snapshot

The LENA Developmental Snapshot, based on a 52-question parent survey, assesses both expressive and receptive language skills and provides an estimate of a child's developmental age from 2 months to 36 months.

## LENA Research Foundation findings

* Parental Perception vs. Reality: Parents often believe they talk more with their children than they actually do.
* Maternal Contribution: Mothers are the primary source of language input, contributing about 75% of the total talk in a child's environment.
* Gender Differences: Mothers tend to talk approximately 9% more to their daughters than to their sons.
* Firstborn Advantage: Parents engage more in conversation with their firstborn child compared to their subsequent children.
* Timing of Conversations: Most adult talk in a child's environment occurs during the late afternoon or early evening.
* Influence of Talkative Parents: Children of talkative parents are more likely to be talkative themselves.
* Impact of Television: Increased television viewing correlates with lower language ability scores in children.
* Autism and Communication: Parents of children with autism tend to speak less as the severity of their child’s symptoms increases. Conversely, parents talk more when their child demonstrates stronger language abilities.