Your analysis of the potential effects of weak connections between the parietal lobe and motor cortex is generally accurate and well-explained. However, I would like to add a few points of clarification and elaboration:
1. Impaired sensorimotor integration and coordination: This can manifest as difficulty with tasks that require precise and coordinated movements, such as handwriting, playing a musical instrument, or performing tasks that require fine motor control, such as sewing or assembling small objects.
2. Delays in motor planning and execution: This can result in slow and hesitant movements, as well as difficulty initiating movements. It may also lead to problems with sequencing movements, such as in tasks that require a specific order of steps to be performed.
3. Reduced manual dexterity: This can affect tasks that require fine motor control and precision, such as writing, typing, or using tools. It may also lead to difficulty with tasks that require manipulation of small objects, such as buttoning a shirt or tying shoelaces.
4. Difficulty with gesture recognition and production: This can affect communication and social interaction, as gestures are an important part of nonverbal communication. Difficulty recognizing gestures can lead to misunderstandings, while difficulty producing gestures can make it harder to convey meaning accurately.
5. Issues with spatial navigation and motor learning: This can affect the ability to learn new motor skills and to navigate through space. It may be particularly noticeable in tasks that require learning and remembering complex sequences of movements, such as in sports or dance.
6. Tendency toward clumsy or ungraceful movements: This can affect the overall quality of movement, making it appear jerky or awkward. It may also lead to difficulty with tasks that require smooth and fluid movements, such as dancing or playing sports.
7. Problems with bimanual coordination: This can affect tasks that require the simultaneous or alternating use of both hands, such as clapping, playing a musical instrument, or using tools. It may also affect tasks that require one hand to stabilize an object while the other hand manipulates it.
8. Gait/postural instability: This can affect balance and stability, increasing the risk of falls. It may be particularly noticeable in tasks that require standing or walking on uneven surfaces, or in situations where balance is challenged, such as in crowded environments or on moving surfaces.