The hypotheses are proposed on the basis of each aspect of coherence，namely global coherence，local coherence and cohesion in layout.

7.2.2.1　Global coherence

The assumption that global coherence is directly related to the reader's expectation of the topical structure also holds for the recognition task.If the sign at issue is very predictable in the discourse topic，then it tends to require little reaction time before the subject can make decision as to whether she has seen it.Vice versa，if the sign is highly unexpected for the discourse topic，then it tends to require longer time for the subject to judge.Therefore，the hypothesis concerning global coherence is：

H1：The stronger the global coherence is，the less reaction time is needed for the subject to make her decision in the recognition task.Reversely，the weaker the global coherence is，the more reaction time she will need to make her decision in the recognition task.

7.2.2.2　Local coherence

As for the local coherence between the verbal and the visual，if the semantic connection or information linking between the two is weak and remote，it is more likely to lead to confusion and poorer comprehension which in turn lead to poorer retrieval for the signs involved.Therefore，the hypothesis is：

H2：The stronger the local coherence is between adjacent verbal and visual signs，the better the probability is for subjects to correctly recognize them.Vice versa，the weaker the local coherence is between adjacent signs，the smaller the probability is for subjects to correctly recognize them.

7.2.2.3　Surface cohesion in layout

The structural cues are not convenient to use as an independent variable for the memory recognition test.However，the effects of salience，for example relative size，on visual recognition memory have been reported in many empirical studies（see for example，Milliken and Jolicoeur，1992）.They find that salient elements can attract attention which can increase the chance for the salient elements to be processed，but does not necessarily lead to comprehension and better memory.Therefore，instead of proposing a specific hypothesis，I will just roughly predict that salience will have significant correlation with results of the recognition memory.