I agree with Lorena and her references, and that this is about automatic art. I think doodling is a possibility for "grafismos". Grafismo is used much more in Spanish than graphism in English, and there are hardly any results for "automatic graphism".

The language of drawing has always been considered the cornerstone of art and as such it reveals the inner process of the artist and his thinking. From the scientific and anatomical sketches of Leonardo Da Vinci to the automatic doodles of the Surrealists...
https://www.allvisualarts.org/exhibitions/BetweentheLines.as...

It was Matta who introduced Motherwell to the concept of “automatic” drawings. The Surrealists often deployed the process of automatism, or abstract “automatic” doodling to tap into their unconscious.[
https://www.revolvy.com/main/index.php?s=Robert Motherwell&i...

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Note added at 10 hrs (2018-04-10 08:08:00 GMT)
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Some examples in Spanish:

Arte argentino del siglo XX. Cronología: 1936
cvaa.com.ar/01sigloxx/04_crono_1936.php
Batlle Planas realiza sus Radiografías paranoicas a partir de grafismos automáticos, método surrealista que adopta en 1930.

Enrique Weisz: Una pintura por y para el hombre - Fco Javier Zubiaur ...
www.zubiaurcarreno.com/enrique-weisz-una-pintura-hombre/
Un historiador del arte haría de estos cuadros una clasificación: por un lado, dentro del surrealismo pictórico, que se realiza plenamente en el simbolismo de los trazos; o, tal vez, en la modalidad -tan seguida hoy en el arte actual- de la escritura o grafismo automático, de ejecución consciente pero pero irracional.