One, a sign language user with Broca's aphasia has difficulty producing signs. But the same signer has no difficulty in drawing pictures or picking up an object. Two, a hearing person becomes paralysed in an accident and loses all motor ability, but is able to speak fluently. What conclusions can we draw from these two cases about how language is represented in the brain?
Brain Language Representation: Case Study Analysis
This question examines how different cases illustrate the brain's organisation of language, particularly the relationship between language production and general motor skills.
Case 1: Sign Language User with Broca's Aphasia
A sign language user with Broca's aphasia experiences difficulty producing signs. Crucially, their ability to perform non-linguistic motor actions like drawing or picking up objects remains unaffected.
- This demonstrates that the specific motor control required for sign language production is distinct from general motor skills. Damage to Broca's area, associated with language production, impairs signing fluency.
- This directly supports the conclusion that Broca's aphasia causes loss of fluency for signers.
- It also supports the idea that the motor control required for language is independent of general motor skills.
Case 2: Hearing Person with Paralysis
A hearing person loses motor ability due to paralysis but retains fluent speech.
- This indicates that while general motor functions are lost, the specific motor pathways controlling speech production (part of language function) are intact and separate.
- This strongly supports the conclusion that the motor control required for language is independent of general motor skills.
Drawing Conclusions
By analyzing both cases:
- Case 1 shows language motor impairment (signing) while general motor skills are intact.
- Case 2 shows general motor impairment (paralysis) while language motor skills (speech) are intact.
- Both cases consistently point towards the independence of language-specific motor control from the body's general motor system.
- Case 1 explicitly confirms that Broca's aphasia affects fluency in sign language, similar to its effect on spoken language.
Therefore, the conclusions drawn are that the motor control for language is independent of general motor skills, and Broca's aphasia impacts fluency in signers.
Important Questions from Biological Basis of Behaviour Neurons Synapses
Consider the following two statements and choose the correct option.
S1: Patients with Broca's aphasia have trouble producing speech.
S2: Patients with Wernicke's aphasia have trouble understanding what others say.- ________ in both lobes of the brain are responsible for coordination and interpretation of information as well as higher mental processing.
- Match the concerned human nervous system with their associated functions.
P. Sympathetic (i) Carrying messages from Central Nervous
System to muscles and glandsQ. Parasympathetic (ii) Carrying messages from senses to Central
Nervous SystemR. Afferent (iii) Maintaining body functions under normal
conditionsS. Efferent (iv) Fight-or-flight system If Central Nervous System = Brain + Spinal Cord, then Peripheral Nervous System = ?
- Match the neurotransmitters with their functions
P. Acetylcholine (i) Movement and pleasure sensation Q. Dopamine (ii) Sleep, anxiety, and appetite R. Serotonin (iii) Attention and memory S. Norepinephrine (iv) Arousal and mood
