---
title: A reflex is a quick automatic movement: in the knee-jerk test the si… — The brain and nerves · tree and pragmatics
description: A reflex is a quick automatic movement: in the knee-jerk test the signal goes to the spinal cord and straight back to the muscle without waiting for the brain. Who acts: reflex, signal. A sentence of the lesson «The brain and nerves» of the biology course of Mova's primary school with its dependency
---

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# The brain and nerves, sentence 9

<!-- .ven lang=en -->
A reflex is a quick automatic movement: in the knee-jerk test the signal goes to the spinal cord and straight back to the muscle without waiting for the brain.

<!-- .vintro -->
**Who acts:** reflex, signal · **What happens:** be, go, wait · **To what, where:** quick automatic movement, jerk test

<!-- .vabout -->
This is a sentence of the lesson «The brain and nerves» of the biology course of Mova's primary school. The page gives its syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause: who acts (reflex, signal), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:biology:068-the-brain-and-nerves.lesson:9
# text = A reflex is a quick automatic movement: in the knee-jerk test the signal goes to the spinal cord and straight back to the muscle without waiting for the brain.
# source = school lesson (ours)
# course = biology
# lesson = 068-the-brain-and-nerves.lesson
# annotation = Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): R5-strong ×1
1	A	a	DET	DT	Definite=Ind|PronType=Art	2	det	_	_
2	reflex	reflex	NOUN	NN	Number=Sing	7	nsubj	_	_
3	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	7	cop	_	_
4	a	a	DET	DT	Definite=Ind|PronType=Art	7	det	_	_
5	quick	quick	ADJ	JJ	Degree=Pos	7	amod	_	_
6	automatic	automatic	ADJ	JJ	Degree=Pos	7	amod	_	_
7	movement	movement	NOUN	NN	Number=Sing	0	root	_	_
8	:	:	PUNCT	:	_	7	punct	_	_
9	in	in	ADP	IN	_	14	case	_	_
10	the	the	DET	DT	Definite=Def|PronType=Art	14	det	_	_
11	knee	knee	NOUN	NN	Number=Sing	13	compound	_	_
12	-	-	PUNCT	HYPH	_	11	punct	_	_
13	jerk	jerk	NOUN	NN	Number=Sing	14	compound	_	_
14	test	test	NOUN	NN	Number=Sing	17	obl	_	_
15	the	the	DET	DT	Definite=Def|PronType=Art	16	det	_	_
16	signal	signal	NOUN	NN	Number=Sing	17	nsubj	_	_
17	goes	go	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	7	parataxis	_	_
18	to	to	ADP	IN	_	21	case	_	_
19	the	the	DET	DT	Definite=Def|PronType=Art	21	det	_	_
20	spinal	spinal	ADJ	JJ	Degree=Pos	21	amod	_	_
21	cord	cord	NOUN	NN	Number=Sing	17	obl	_	_
22	and	and	CCONJ	CC	_	21	cc	_	_
23	straight	straight	ADV	RB	_	24	advmod	_	Agree=R5-strong|Haiku=27:advmod
24	back	back	ADV	RB	_	27	advmod	_	_
25	to	to	ADP	IN	_	27	case	_	_
26	the	the	DET	DT	Definite=Def|PronType=Art	27	det	_	_
27	muscle	muscle	NOUN	NN	Number=Sing	21	conj	_	_
28	without	without	SCONJ	IN	_	29	mark	_	_
29	waiting	wait	VERB	VBG	Tense=Pres|VerbForm=Part	27	advcl	_	_
30	for	for	ADP	IN	_	32	case	_	_
31	the	the	DET	DT	Definite=Def|PronType=Art	32	det	_	_
32	brain	brain	NOUN	NN	Number=Sing	29	obl	_	_
33	.	.	PUNCT	.	_	7	punct	_	_
```

## Pragmatics {#pragmatics}

<!-- .note -->
No stored speech act for this sentence.

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is a** | present | a reflex | a quick automatic movement |  |  |  |  | tree rules |
| 2 | **go** | present | the signal |  |  | the jerk test |  | to the spinal cord and the muscle | vn escape-51.1-1 «NP V PP.initial\_location»: agent=Theme to cord=Initial\_Location |
| 3 | **wait** | gerund | the signal *not said here* |  |  |  |  | for the brain | vn exist-47.1 «NP V»: agent=Theme |

<!-- .note -->
One row per clause the reader finds. «not said here»: a role filled from the clause above. «roles by»: a VerbNet class and frame when one fits the verb, else the reader's rules on the tree.

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**Licence: [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)**, as the whole of Mova corpus 0.4, of which this treebank (the agreed school, `mova-school-agreed-en.conllu`) is part. The lessons were written for Mova's primary school. Sentence `school:biology:068-the-brain-and-nerves.lesson:9`.

**The tree:** Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): R5-strong ×1. **The frames** are read from the tree by Mova's frames reader (`prag`) when this page is built, the lesson read in order, so a pronoun may be resolved from an earlier sentence.

See the [release 0.4](https://md.mova.elamur.ai/free/en/releases/0.4/).

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