By Geeta PandeyBBC News, Delhi

This handout photograph released by India"s Press Information Bureau (PIB) on March 4, 2019, shows Indian Prime Minister Narendra Modi addressing a gathering during during the inauguration of various development projects in Jamnagar, in the Indian state of Gujarat.
Image captionNarendra Modi is facing an election by the end of May

A leading expert in child psychology says that Indian Prime Minister Narendra Modi must apologise after he appeared to poke fun at dyslexia at a public event, triggering outrage.

Mr Modi questioned if a programme for dyslexic children could also help a “40 to 50-year-old child” – in remarks that appeared to be an attempt to ridicule his political rival Rahul Gandhi.

“When the head of a country talks like this, it is very, very insensitive. He must apologise,” Dr Roma Kumar said.

Her voice adds weight to the wave of condemnation of Mr Modi’s comments.

Dr Kumar is a clinical psychologist who specialises in learning disabilities and has worked at Delhi’s Sir Ganga Ram Hospital for the past three decades.

Dyslexia is a common learning difficulty that can affect reading, writing and spelling.

Some well-known people with dyslexia include director Steven Spielberg and actors Tom Cruise and Abhishek Bachchan.

According to a 2015 government estimate, at least 10% – or nearly 35 million – Indian children are dyslexic, although Dr Kumar says she believes the numbers to be much higher because there’s “very little awareness” about the condition.

“In the metro cities, teachers and parents are a little sensitised, but in smaller towns and rural areas, there is very little awareness. We don’t have the tools to identify the children with learning difficulties in government schools, smaller towns and villages,” she says.

Mr Modi’s comments were made on Saturday night when he was addressing engineering students who were participating in the Smart India Hackathon – an event meant to encourage students to come up with technology-driven solutions to issues related to women and child safety.

The controversial comments came as an engineering student began telling Mr Modi – who was speaking via video link – about her programme.

“We have an idea to help dyslexic children,” she said, “whose pace of learning and writing is very slow. But they have a high intelligence and creativity level.”

She then referred to Taare Zameen Par, the 2007 Bollywood hit film which centred around a dyslexic child.

At this point, the prime minister interrupted her and asked, “Will this programme work for a 40 to 50-year-old child too?”

As the room dissolved into laughter and students began clapping, she answered: “Yes sir, it will.”‘For 35 years I didn’t know I was dyslexic’

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But before she could move on, the prime minister again interjected, saying: “Then that will make the mothers of such children very happy.”

Though Mr Modi did not name any names, it was immediately obvious that he was attempting to ridicule Rahul Gandhi, the opposition Congress party president, and his mother, Sonia Gandhi, also a politician. India faces a looming election before the end of May.

Considering there’s never been any talk of Mr Gandhi being dyslexic, the prime minister’s latest comments are being seen as a distasteful attempt to denigrate his political rival. Mr Modi has often described Mr Gandhi as “Pappu” – a generic name to signify a bumbling man of low intelligence.

But the joke seems to have backfired, with the prime minister being castigated for his remarks. Many opposition leaders and citizens took to social media to criticise him:Skip Twitter post by @SitaramYechury

Shameful and distressing. Some of us have dyslexic or disabled relatives, friends, children and parents. Sattar saal mein pehli baar, a person with this crassness occupies the chair of the PM. Enough, Mr Modi. Yeh hain sanskar aapke? https://t.co/8wBvtjPy7q— Sitaram Yechury (@SitaramYechury) March 3, 2019

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End of Twitter post by @SitaramYechurySkip Twitter post by @khanumarfa

He denied global warming exists.
He insulted specially-abled people by calling them ‘Divyang’.
He joked about Indian pilot in enemy captivity as ‘pilot project’. 
Now he is mocking dyslexia and people suffering from it to target a political opponent.
Who is this insensitive man ?— Arfa Khanum Sherwani (@khanumarfa) March 3, 2019

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End of Twitter post by @khanumarfaSkip Twitter post by @Joydas

Making fun of Dyslexia to target political opponent. There is no low which is too Low for Narendra Modi. Worse are the students who were clapping but cant blame them. When the PM of the Nation is such a Cheap Man, they had to entertain him pic.twitter.com/bJ7apIlpup— Joy (@Joydas) March 3, 2019

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End of Twitter post by @Joydas

Neither Mr Gandhi nor his Congress party have so far commented. Mr Modi and his BJP party have not responded to the criticism.

His supporters on Twitter – normally highly vocal – have not addressed the issue directly, though a few suggested that Mr Modi was mocking Rahul Gandhi and not dyslexics.

But on social media and in press commentary, condemnation has been the overwhelming sentiment. Mr Modi, says Dr Kumar, “should apologise to the country, especially to those children and young adults who are dyslexic”