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They showed that in ambiguous stimuli, the amount of Shannon's information covaries with stimulus ambiguity.
A likely reason is that in ambiguous stimuli, observers tended to vacillate between response alternatives, consistent with the notion that stimulus uncertainty of ambiguous stimuli was high.
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Thus, while spider phobic individuals were liberal in classifying ambiguous stimuli as spiders, starting at picture 5 and even 4 if using a one-sided test, spider aficionados were more conservative in labeling ambiguous stimuli such as picture 4 as a flower.
Therefore, the requirement to repeatedly practise generating positive imagery in response to ambiguous stimuli in this CBM paradigm may make it particularly suitable for clinical application in depression.
These results do not support our main hypotheses, and run contrary to other studies which have found that animals undergoing a treatment designed to induce a more negative/less positive affective state are likely to respond to ambiguous stimuli in a manner in keeping with a more 'pessimistic'/less 'optimistic' judgement of their outcome.
Specifically, we test the hypothesis that wild-caught captive European starlings (Sturnus vulgaris) are more optimistic in their interpretation of ambiguous stimuli when they are housed in cages designed to promote greater welfare compared with when they are housed in standard laboratory cages.
This experiment was optimized for psychometric curve-fitting, a method often employed to exploit the instability linked to ambiguous stimuli in order to test subtle shifts in perception induced by an external manipulation [73].
Rats housed in unpredictable housing conditions that induce a mild negative depression-like state [12,13] were less likely to judge ambiguous tones as predicting a rewarding outcome than those housed in control conditions – they showed a pessimistic-like bias in line with findings that people in negative states judge ambiguous stimuli negatively [3,8,9].
The pictures alone can be considered a form of ambiguous stimuli, in that the word captions steer their interpretation as positive or negative.
That the bias might be not merely cognitive is also suggested by the faster responses to ambiguous stimuli in spider phobic persons.
People with high levels of anxiety or worry show cognitive biases towards threat (Hayes & Hirsch, 2007), making them more likely to detect threat and to interpret ambiguous stimuli in a threatening way.
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Justyna Jupowicz-Kozak
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