The Use of Iambic Pentameter in the

frequency channels at specific ranges help detect specific types of visual information
(e.g., Goffaux, Gautheir, & Rossion, 2003; Nasanen, 1999). Specifically, low spatial
frequencies (LSFs) encode coarse scene information (defined by larger less detailed
parts) whereas high spatial frequencies (HSFs) encode fine scene information (defined by
detailed parts) (Morrison & Schyns, 2001).
Recent research suggests that there is a time course of coarse and fine spatial
frequency processing. There are two main views on how this time course occurs. These
views are known as the Fixed and Flexible Usage hypotheses. According to the most
popular version of the Fixed Usage hypothesis, processing of spatial scales begins with
coarse information and then proceeds to fine scene information (Breitmeyer, 1984;
Fiorentini, Maffei, & Sandini, 1983; Parker & Costen, 1999; Schyns and Oliva, 1994;
Vannucci,Viggiano, & Argenti, 2001). That is, interpretations of spatial scenes are first
based on low spatial frequency information and then are later based on high frequency
information.
Support for the Fixed Usage hypothesis has been found in several experiments. In
one such experiment, Schyns and Oliva (1994) tested human perception of coarse and
fine scene details. Participants were presented with ambiguous experimental primes that
were hybrids of two perceptual scenes. One perceptual scene was presented as coarse
detailed, low frequency information. The second perceptual scene was presented as fine
detailed, high frequency information. Primes were presented for 30 and 150ms durations.
Target stimuli either matched the coarse blobs or fine edges of the ambiguous hybrid
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