The Welfare Reform Tracking Study, which was carried out by Edinburgh Napier University on behalf of the Scottish government, also highlighted criticism of how the details of reforms were communicated to recipients of benefits.
Some disabled people who took part in the study said they felt they had to present themselves in a "negative light and focus on their limitations" when claiming.
'Damaging effect'
Other participants spoke of stress, anxiety and depression brought on by assessments, and a fear of further changes.
Mr Neil accused the UK government's "austerity agenda and benefit cuts" of having a "damaging effect" on people in Scotland.