In their attempt to better understand the Fusiform Face Area (FFA), Gauthier and colleagues (1999) have found that:

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The question asks about Gauthier et al. (1999) and how the Fusiform Face Area (FFA) responded to the presentation of Greebles in relation to faces, with a particular emphasis on expertise. 
Option a: 'The presentation of “Greebles” led to similar activation in the FFA compared to faces during the entire experiment.' This is inaccurate because the key finding was not that FFA activation aligned with faces throughout the entire experiment; rather, activation became similar only after participants had developed expertise with Greebles. The claim of similarity during the entire experiment would ignore the role of acquiring expertise. 
Option b: 'The presentation of “Greebles” led to similar activation in the FFA compared to faces only before participants became experts for them.' This is the opposite of what was observed. Before expertise is established, Greebles typically do not elicit FFA activation at the same level as faces, so this statement mischaracterizes the temporal pattern of activation relative to expertise. 
Option c: 'The presentation of “Greebles” led to similar activation in the FFA compared to faces only if they also had faces.' This posits a condition that is not supported by the original finding. The study emphasizes expertise with Greebles rather than comparing “having faces” as a condition; the FFA response to Greebles after expertise is what matched faces, not a conditional on also having faces. 
Option d: 'The presentation of “Greebles” led to similar activation in the FFA compared to faces only after participants became experts for them.' This aligns with the core result: FFA activation to Greebles becomes similar to that for faces once participants reach expertise with Greebles, reflecting the view that the FFA is responsive to experts’ fine-grained perceptual discrimination of a category, not exclusively to faces. 
In summary, the correct interpretation is that FFA activation to Greebles parallels face activation only after expertise has been acquired, highlighting the role of perceptual expertise in shaping FFA sensitivity. The other options misstate the timing, conditionality, or scope of the FFA response in relation to Greebles and faces, leading to incorrect conclusions about the effect of expertise on FFA activation.

In their attempt to better understand the Fusiform Face Area (FFA), Gauthier and colleagues (1999) have found that:Single choice

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