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If we place a fork in the right hand of a right-handed person with an intact corpus callosum

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the information goes to the left hemisphere where language is processed.

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If we place the spoon in the left hand of this person

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the information now goes to the right hemisphere with little language ability

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but the information then crosses the corpus callosum to the left hemisphere where language processing resides.

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Similarly, in the visual system, if the word is flashed to the left visual field

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the word goes to the right hemisphere

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then crosses the corpus callosum to the left hemisphere and we can read the word.

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The opposite is true for our puzzle task

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If a right-handed person with an intact corpus callosum is forced to use their right hand for the puzzle

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the information goes to the left hemisphere which struggles with spatial tasks

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but this information can cross the corpus callosum to the right hemisphere to allow this person to solve the puzzle.