Opendata, web and dolomites


Perception of signals under varying conditions: implications of proportional processing of signal magnitude for signal design

Total Cost €


EC-Contrib. €






 CATPERCCOL project word cloud

Explore the words cloud of the CATPERCCOL project. It provides you a very rough idea of what is the project "CATPERCCOL" about.

maculatus    ranges    tests    manipulating    animal    compare    agonistic    taxa    sword    insights    generality    follows    color    swordtail    length    xiphophorus    green    male    discontinuous    concomitant    training    vision    sexual    first    stimuli    perceptual    swords    perception    irrelevant    acuities    caudal    primates    human    bars    circles    forefront    shown    perceived    collaborative    environment    modalities    auditory    trait    relationship    stimulus    signal    70mm    mate    evolution    spans    discriminate    host    expertise    signaling    dimorphism    acoustic    visual    differs    proportional    tested    interactions    proportionally    helleri    readily    certain    assume    law    female    examine    mechanism    males    viewer    perceive    opening    exhibits    indicate    behavior    mechanisms    females    differ    behaviours    combining    nature    models    extended    invaluable    career    variation    signals    discontinuously    operate    shows    amount    encounters    kelley    receiver    humans    modal    fin    variety    magnitude    organisation    exeter    environmental    dr    implicitly    vary    species    individuals    swordtails    signaler    data    reflecting    interact    weber    quality   

Project "CATPERCCOL" data sheet

The following table provides information about the project.


Organization address
city: EXETER
postcode: EX4 4QJ

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country United Kingdom [UK]
 Total cost 183˙454 €
 EC max contribution 183˙454 € (100%)
 Programme 1. H2020-EU.1.3.2. (Nurturing excellence by means of cross-border and cross-sector mobility)
 Code Call H2020-MSCA-IF-2017
 Funding Scheme MSCA-IF-EF-ST
 Starting year 2019
 Duration (year-month-day) from 2019-08-15   to  2021-08-14


Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 
1    THE UNIVERSITY OF EXETER UK (EXETER) coordinator 183˙454.00


 Project objective

Individuals evaluate one another during interactions using assessment signals that indicate quality, and these signals vary across individuals, reflecting variation in signaler quality. For example, green swordtail (Xiphophorus helleri) females assess the length of an extended caudal fin (known as a sword) on males, which ranges in length from 10-70mm in nature, during mate choice, and males evaluate one another’s swords during agonistic encounters. Models of signal evolution implicitly assume that signals are perceived continuously, meaning that each change in signal magnitude is both perceived by the receiver and results in a concomitant change in receiver response. Increasing evidence, however, shows that signals across modalities, from acoustic signals to color-based visual signals, can be perceived discontinuously. One mechanism by which stimuli can be perceived discontinuously is called proportional processing, which follows Weber’s law. Under proportional processing, a viewer can more readily discriminate between two stimuli that differ by a certain amount when both of those stimuli are of low magnitude, compared with two stimuli that differ by the same amount but are both high magnitude. Although proportional processing has been shown to operate across a variety of taxa and modalities, no study has yet tested for proportional processing of a visual signal. This project will (1) test whether signal magnitude, i.e. male sword length, is perceived continuously or proportionally by female and male swordtails; (2) assess how perception of stimulus magnitude is affected by variation in environmental conditions, by manipulating both the visual and auditory environment; (3) compare perception of signal-relevant (bars) and signal-irrelevant (circles) stimuli, between a swordtail species that exhibits sexual dimorphism in sword length (X. helleri) with one that does not (X. maculatus), to examine the evolution of perceptual processes; and (4) compare perception of the signal magnitude in swordtails with existing data on length perception in a variety of taxa (including humans), to examine the generality of proportional processing of length across species, and how perception differs between species with very different visual acuities (ability to perceive detail) and signaling behaviours. This project will be the first to examine proportional processing of a visual signaling trait in any non-human animal and will provide the first tests of how viewing conditions and multi-modal stimuli impact perception of signal magnitude in non-primates. By combining my expertise in different mechanisms of discontinuous perception with the expertise of Dr Kelley at Exeter, which spans animal behavior, acoustic signaling, and perceptual processing, we will (1) provide novel insights into the relationship between signal design, behaviour, and environment, (2) increase our understanding of how vision and higher-level perceptual processes interact in the perceptual organisation of stimuli, and (3) provide invaluable training in managing a large project at the forefront of perception research, thus opening a host of career and collaborative opportunities.

Are you the coordinator (or a participant) of this project? Plaese send me more information about the "CATPERCCOL" project.

For instance: the website url (it has not provided by EU-opendata yet), the logo, a more detailed description of the project (in plain text as a rtf file or a word file), some pictures (as picture files, not embedded into any word file), twitter account, linkedin page, etc.

Send me an  email ( and I put them in your project's page as son as possible.

Thanks. And then put a link of this page into your project's website.

The information about "CATPERCCOL" are provided by the European Opendata Portal: CORDIS opendata.

More projects from the same programme (H2020-EU.1.3.2.)

PNAIC (2018)

Positive and Negative Asymmetry in Intergroup Contact: Its Impact on Linguistic Forms of Communication and Physiological Responses

Read More  

FrogsInSpace (2019)

From ecology to neurobiology: spatial cognition in rainforest frogs

Read More  

TIPTOP (2019)

Tensoring Positive Maps on Operator Structures

Read More