Yumiko Fujii, Masahiko Morita and Hiromi Morita, University of Tsukuba, Japan.

INTRODUCTION

Paired-attributemodel

In the human visual system, diﬀerent attributes of an object areprocessed separately in diﬀerent modules and then integrated toelicit a speciﬁc response. These attributes are written to theobject ﬁle.
We investigated how these attributes are connected with eachother in the object ﬁle and associated with the response byconducting stimulus–response mapping experiments. We haveconducted S-R mapping experiments with the stimuli consisting ofshape, color and texture (Ishizaki et al., 2015) and obtained theresults supporting the paired-attribute model (Morokami et al.,2010).

Participants learn the mapping of eight stimulus items to four
response keys.

Stimulus

Eight types of items, made by combining one of two values ofthree attributes(color, shape, and location).

Response keys

Four keys arranged in vertical on the numeric keypad

RESPONSERESPONSE

Purpose(1) “Paired-attribute model” works in general independent of thekind of attributes?
(2) Location is combined with shape or color in the same way as theshape and color are combined?

RESULTS & DISCUSSION

100%

Percent correct

Exp 1 : Stimulus-Response Mapping Task

Color Texture

Exp 1 :■ Percent correct
versus block number
100%＊＊＊：p＜0.001＋：p＜0.1080%＊＊ ＊ ＊＊ ＊ ＊＊ ＊60% ＋SCSL
CL
SCL

40%
20%
0%

80%
60%
SCSLCLSCL

40%20%0%■ RT (2nd Test block)
＊＊＊

1000

＊＊：p＜0.01＊：p＜0.05＊＊

Response time[ms]

28 students aged 18-28 with normal orcorrected vision.

Color Texture

Shape TEXTURE

・・・ the unit of memory

Percent correct

METHOD

ShapeRESPONSE

Here we present the experimental results supporting the modelwith the stimuli consisting of shape, color and location in place oftexture.

Participants

Shapeadd

Color

All-attribute
model

800
600
400

CL(color–location) set

key C

SCL(shape-color–location) set
key D

Procedure▷ Two attributes arerelevant to the response.

relevant to the response.

Designpress a response key
A 400 Hz buzzer sounds if
the response is incorrect.

＋14 learning blocks with time limit
2 test blocks without time limit■1 block comprises 80 trials

If participants cannot respond to the target within thetime limit, a 900 Hz buzzer sounds and the next trial start.

Exp 2 : Discrimination Task

Participants discriminate individual attributes of stimuli.
Stimulus The same eight items as used in Exp 1.
Response keys Two keys arranged in vertical

Procedure

Designpress a response key
1.4 s,1.5 s, or 1.6 s

A 400 Hz buzzer sounds if
the response is incorrect.

1 block for each of three attributes■ 1 block consisted of 96 trials.

＋e.g. Discrimination of color attribute
Participants press the key A If the presented item isred, press the key B if it is green.

SLCLSCL■ Which attribute might participants confuse?
(average for blocks 10–14)▷ All attributes areSC(1) The date of percent correct of learning phase and RT of test
phase means that mapping of SCL items to the response is morediﬃcult than that of SC, SL and CL items.

➡ Incorrect responses are considered
to result from confusing one of theattributes. Thus the data mightsuggest that the participants tend
to confuse or ignore location.

＊60%＊：p＜0.0550%
40%
30%
20%
10%0%

color shape location

Exp 2 :■ Is the latency of perceiving the(2) The integrated
same among these three attributes? representations of
700

100%
＊＊

500
300

＊

＊＊＊

95%
90%

100

85%

-10080%color shape location＊＊＊：p＜0.001

Percent correct

SL(shape–location) set

200

later phase

percent incorrect

key B

key A

middle phase0

Response time[ms]

SC(shape–color) set

1.0 s

initial phase

Percent
correct
Responsetime

shape-location and colorlocation might have
weaker binding strengththan the integrated
representations of shapecolor.

CONCLUSION(1) The paired-attribute model is supported. Results
suggest that integrated representations of shapelocation and color-location as well as shape-color (butnot shape-color-location) representations are formed
to be associated with response.
(2) Location is not dealt with diﬀerently from shape orcolor in the attribute integration process, but shapelocation and color-location items are more diﬃcult toassociate with responses than shape-color item.

Shape

ColorLocationRESPONSE