Garner Interference

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The Simon Effect
One of two stimuli (i.e., a red or green square)
appears either to the left or right of the
screen. People press a button on the lefthand
side of the keyboard in response to presentation
of one of the stimuli (e.g., the green
one). People press a button on the righthand
side of the keyboard in response to presentation
of the other stimulus (e.g., the red one)
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The Simon Effect
Congruent Condition Response required MATCHES
the side the stimulus appears on. (e.g., green
stimulus appears on the LEFT red stimulus
appears on the RIGHT) Incongruent
Condition Response required MISMATCHES the side
the stimulus appears on. (e.g., green stimulus
appears on the RIGHT red stimulus appears on
the LEFT)
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The Simon Effect
Average Response Time
Congruent
Incongruent
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The Muller-Lyer Illusion
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The Muller-Lyer Illusion
The Muller-Lyer Line (or winged line) (an
example is the top line on the preceding
slide) was always 100 pixels long. The
Comparison Line (without wings) varied in length
from 85 pixels to 127 pixels. On the y-axis of
the graph on the next slide Displays the
likelihood of judging the Comparison Line (the
line without wings) as longer On the x-axis
of the graph on the next slide Displays the
pixel length of the Comparison Line (the line
without wings).
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The Point of Subjective Equality
People were equally likely to judge the
Muller-Lyer Line and the Comparison Line as
Longer when The Comparison Line (w/o wings)
was 115 Pixels Long Since the Muller-Lyer Line
was always 100 Pixels Long you tended to
misperceive the Muller-Lyer line as about 15
pixels longer than the Comparison Line. (even
when the two lines were the same length)
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Garner Interference
People judge either the size (large vs. small) or
the brightness (light vs. dark) of a stimulus.
Baseline Condition Saturation of the stimulus
(how vividly colorful it is) remained the
same. Correlated Condition Saturation of the
stimulus varied in tandem with size or
brightness. (e.g., light stimulus always highly
saturated dark stimulus always low in
saturation)
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Garner Interference
Filtering Condition Saturation of the stimulus
varied in at random with size or
brightness. (e.g., light and dark stimuli were
either high or low in saturation equally often)
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Garner Interference
Separable Dimensions SIZE and SATURATION are
separable dimensions Size judgments SHOULD NOT
be influenced by whether saturation is
correlated with size or varies randomly with
size.
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Garner Interference
Integral Dimensions BRIGHTNESS and SATURATION
are inseparable dimensions Brightness
judgments SHOULD be influenced by whether
saturation is correlated with size or varies
randomly with size.
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Garner Interference
Compared to the Baseline condition (when
saturation stays the same) Correlating
saturation w/ brightness should lead to faster
brightness judgments. Random pairing of
saturation w/ brightness (in the Filtering
Condition) should lead to particularly slow
brightness judgments.
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Baseline
Average Response Time
Correlated
Filtering
Size Judgments (Separable)
Brightness Judgments (Integral)